Physical health of care-experienced young children in high-income countries: A scoping review

This scoping review of 36 studies from high-income countries identifies significant physical health challenges among care-experienced children under seven, such as poor growth, dental issues, and low immunization rates, while highlighting critical research gaps regarding causes and prevalence due to methodological limitations and a lack of comparator groups.

The Gist

Imagine a group of young children, all under the age of seven, who have had to leave their biological parents' homes for various reasons. Some are living with relatives (kinship care), some with foster families, some in group homes, and some have been adopted. These children are like seeds that have been uprooted from their original soil.

This research paper is a garden survey. The authors wanted to know: How healthy are these uprooted seeds compared to other seeds that stayed in their original soil? They looked at 36 different studies from wealthy countries (like the US, UK, Australia, and Sweden) to see what physical health problems these children face.

Here is the breakdown of their findings, using simple analogies:

1. The Big Picture: A "Health Gap"

The researchers found that, generally, these children are like cars that have been driven on rougher roads than their peers. They face more bumps, dents, and mechanical issues. While we can't say exactly why for every single problem (because the studies weren't perfect), the trend is clear: children in care often have poorer physical health than children who have never been in care.

2. The Specific "Bumps" on the Road

The survey identified several specific areas where these children struggle:

• Stunted Growth (The "Small Seedling" Problem):
  Many of these children are shorter and lighter than they should be for their age. It's like a plant that hasn't gotten enough water or sunlight. The study found that a significant number of children under two were "stunted." However, there is good news: once they moved into a stable care home, many started growing again, like a plant finally getting the right nutrients.
• Teeth Trouble (The "Cavities" Crisis):
  This was one of the clearest findings. Children in care had much worse dental health. Imagine a house where the plumbing is neglected; the pipes (teeth) get rot and damage. The study found that children in care were twice as likely to need urgent dental work compared to other kids.
• The "Missing Shield" (Vaccinations):
  Vaccines are like a shield against invisible monsters (diseases). The study found that children in care were less likely to have their shields fully charged. Sometimes this is because their medical records got lost (like a lost insurance card), but often they simply missed their shots.
• Skin and Blood Issues:
  They found more skin rashes (often from poor hygiene or diaper care) and more cases of anemia (low iron in the blood, making them tired and weak). Think of these as signs that the "maintenance crew" wasn't able to do its job effectively before the child entered care.
• Motor Skills (The "Wobbly Walker"):
  Many children struggled with moving their bodies—both big movements (running, jumping) and small ones (holding a spoon, drawing). It's as if their internal GPS for movement was a bit glitchy.

3. The "Missing Map" Problem (Why it's hard to be sure)

The authors admit that their map is a bit blurry. Here is why:

• No Control Group: In many studies, they looked at the children in care but didn't have a "control group" (a group of similar kids not in care) to compare them to. It's like trying to judge if a car is fast without having a stopwatch or another car to race against.
• The "Poverty" Factor: Children in care often come from very poor backgrounds. Poverty itself is like a heavy backpack that makes it hard to run. The studies often didn't separate the effects of "being in care" from the effects of "being poor."
• Mixed Bags: Some studies mixed up babies, toddlers, and older kids, or mixed up foster homes with group homes. It's like trying to measure the height of a sapling and an oak tree with the same ruler; it gets confusing.

4. The Takeaway: What Should We Do?

The paper concludes that while we need better data, the evidence is strong enough to say: These children need extra help.

• Fix the Foundation: We need to check their height, weight, teeth, and vaccines regularly, just like a mechanic doing a routine check-up on a car.
• Better Data: Future studies need to be smarter. They need to compare these children to other children who are also poor but not in care, so we can see if the "care system" itself is the problem, or if it's just the poverty they came from.
• Systemic Change: The authors suggest that many of these health issues aren't just about "bad parenting" but about systemic issues (like poverty, stress, and lack of resources). You can't fix a plant's growth just by moving it to a new pot; you also need to fix the soil it came from.

In short: These young children are like travelers who started their journey with a broken suitcase. This review shows us exactly what's broken (teeth, growth, vaccines) so we can help pack them a better suitcase for the rest of their journey. But to do that, we need better maps (research) to understand exactly where the holes are.

Technical Summary

1. Problem Statement

Care-experienced children (those in out-of-home care, foster care, kinship care, or adoption) face significant barriers to good physical health compared to their peers. While early childhood health is critical for long-term quality of life, there is a paucity of research specifically focusing on physical health outcomes in young care-experienced children (under seven years of age) within high-income countries.

Existing literature often aggregates children of all ages or focuses on mental health and developmental outcomes. Furthermore, many studies fail to distinguish between children entering care due to complex medical conditions versus those entering due to abuse or neglect, potentially confounding results. There is a need to synthesize existing evidence to identify specific physical health gaps, inform policy, and guide future research methodologies.

2. Methodology

The authors conducted a scoping review following the Arksey and O'Malley framework, refined by Levac et al., and adhering to PRISMA-ScR guidelines.

• Search Strategy: Comprehensive searches were performed in MEDLINE, CINAHL, and Web of Science Core Collection up to October 1, 2024. Manual searches of reference lists were also conducted.
• Inclusion Criteria (PCC Framework):
  • Population: Children under 7 years old with care experience (kinship, foster, residential, adoptive, or parental care with social work support). Excluded were children entering care primarily for complex medical needs or neonatal adoptees (to avoid prenatal confounding).
  • Concept: Physical health outcomes (diagnosed by professionals, validated scales, or physiological markers like anemia).
  • Context: High-income countries (World Bank classification).
• Exclusion Criteria: Studies dominated by children with primary medical reasons for care, disease outbreaks in residential settings, neonatal-only samples, and non-English titles/abstracts.
• Data Extraction & Quality: Two reviewers screened titles, abstracts, and full texts. Data was extracted regarding study characteristics, demographics, and specific health outcomes. A bespoke quality assessment checklist was used to identify studies with comparator groups and adjustments for socioeconomic status (SES).
• Synthesis: A narrative synthesis was used due to the heterogeneity of study designs and outcomes.

3. Key Contributions

• First Specialized Review: This is the first review to specifically collate evidence on the physical health of children under seven in high-income countries, distinguishing this age group from older cohorts where health profiles differ significantly.
• Methodological Critique: The review highlights critical flaws in existing literature, specifically the lack of appropriate comparator groups, failure to adjust for socioeconomic deprivation, and heterogeneity in care settings.
• Evidence Mapping: It provides a comprehensive map of which physical conditions have been studied (e.g., dental health, growth) and which remain under-researched.

4. Results

From 17,363 initial records, 36 studies were included. The majority of studies were conducted in the USA (58.3%), followed by the UK and Australia. Most studies were cross-sectional (83.3%) and often lacked specific care-setting disaggregation.

Key Health Findings:

• Physical Development (Height/Weight): Consistent evidence indicates poor physical development. A significant proportion of children enter care with stunted growth (height/weight below the 5th percentile). However, longitudinal data suggests that placement in care often leads to improvements in growth trajectories (catch-up growth) within the first year, provided chronic deprivation is mitigated.
• Dental Health: This is the most robustly supported area of poor health. Care-experienced children have significantly higher rates of dental caries, tooth trauma, and urgent treatment needs compared to peers. One study found 66.6% of looked-after children required further dental treatment.
• Immunisation: Rates of incomplete immunisation are generally lower in care-experienced children, though this is often confounded by missing medical records rather than lack of administration.
• Mortality: Children in care have higher mortality rates than the general population (Rate Ratios ranging from 1.84 to 2.46), with Sudden Infant Death Syndrome (SIDS) and congenital anomalies being leading causes.
• Other Conditions:
  • Dermatological: High prevalence (up to 66% in entry-screening studies), likely linked to neglect and hygiene.
  • Respiratory: Asthma prevalence appears elevated (up to 3x national average in some studies), though diagnostic criteria vary.
  • Haematological: Anemia is frequently reported (7–22% in various samples).
  • Motor Control: Significant rates of atypical gross and fine motor development (approx. 20–36%).
  • Congenital Conditions: High rates of Fetal Alcohol Syndrome (FAS) and Down's syndrome were noted in specific sub-samples (e.g., residential care).

Limitations of the Evidence Base:

• Lack of Comparators: Only 27.8% of included studies used a comparator group.
• Confounding Variables: Only 13.9% of studies adjusted for socioeconomic status (SES), despite the fact that care-experienced children disproportionately come from deprived backgrounds.
• Heterogeneity: Studies often mixed different care types (foster, kinship, residential) and age groups, making it difficult to isolate the effect of the care environment itself.

5. Significance and Implications

• Policy and Practice: The review confirms that young care-experienced children suffer from significant physical health inequalities, particularly in dental health, growth, and immunisation. It underscores the need for proactive, routine health screening upon entry to care and continuous monitoring.
• Research Recommendations: Future research must:
  1. Utilize matched comparator groups (accounting for SES, age, and sex).
  2. Clearly report care settings (distinguishing between foster, kinship, and residential).
  3. Focus on specific developmental stages rather than broad age ranges.
  4. Address the structural drivers of poor health (poverty, neglect) rather than just treating symptoms.
• Conclusion: While care placement can offer a "protective" effect on physical growth (catch-up), the evidence suggests that without addressing underlying socioeconomic deprivation and ensuring consistent healthcare access, these children remain at a distinct disadvantage compared to their non-care-experienced peers. The current evidence base is insufficient to draw definitive causal conclusions for many conditions due to methodological weaknesses.