Lead and cadmium contamination in a large sample of United States infant formulas and baby foods

Gardener H; Bowen J; Callan SP

doi:10.1016/j.scitotenv.2018.09.026

Gardener 2019 — Lead And Cadmium In US Infant Formulas And Baby Foods

Summary

This peer-reviewed study measured lead and cadmium in 564 US infant formula and baby-food products purchased from conventional stores, natural/organic stores, online retailers, and direct-to-consumer sources. It is a high-priority distribution source because it reports full-sample percentiles, category sample counts, and infant-formula exposure percentiles.

Study Scope

Field	Value
Product scope	Infant formula, toddler formula, cereals, kids’ meals, juices/drinks, jars/first meals, pouches, snacks, and electrolyte solutions
Total sample size	564 products
Infant formula sample size	91 products
Solid baby-food sample size used in serving/calorie tables	471 products
Purchase frame	Denver-area conventional and natural/organic supermarkets, online retailers, and direct-to-consumer sources
Product selection	Convenience sample informed by mainstream retail sales, natural/organic retail, and online/direct-to-consumer availability
Analytical method	ICP-MS, modified EPA Method 6020A, kinetic energy distribution mode
Quantification limits	Cadmium LOQ 2 ppb; lead LOQ 4 ppb
Non-detect handling	Non-detects imputed as 0 ug/kg for distribution analyses

Product Counts By Category

Category	N
Infant formula	91
Baby cereals	30
Kids’ meals	23 in sample-purchase description; 58 in solid-food exceedance tables
Toddler formula	22
Juices/drinks	30 in sample-purchase description; 25 in solid-food exceedance tables
Jars/first meals	107 in sample-purchase description; 112 in solid-food exceedance tables
Pouches	140 in sample-purchase description; 138 in solid-food exceedance tables
Snacks	107 in sample-purchase description; 108 in solid-food exceedance tables
Electrolyte solutions	14

Full-Sample Concentration Distribution

These percentiles describe the paper’s full 564-product source pool. They are not cereal-specific, formula-format-specific, rice-status-specific, or HMTc aggregate threshold values.

Analyte	N	Detection frequency	p25	p50	p75	p90	p95	p99	p100 max	Unit	Table
Cadmium	564	321/564, 57%	0, non-detect	2.76	9.54	20.75	29.44	42.50	103.90	ug/kg, equivalent to ppb	Table 1
Lead	564	210/564, 37%	0, non-detect	0, non-detect	5.60	10.80	18.50	62.75	183.60	ug/kg, equivalent to ppb	Table 1

Infant Formula Exposure Distribution

The paper reports infant-formula values as estimated daily intake from 31 oz formula consumed by a four-month-old infant, not as product concentration. These values are still useful for formula-row risk screening, but they should not be mixed with product-concentration ppb rows.

Analyte	Formula N	Statistic	Estimated daily exposure	Unit	Table
Lead	91	p50	0.00	ug/day	Table 4
Lead	91	p75	0.43	ug/day	Table 4
Lead	91	p90	0.78	ug/day	Table 4
Lead	91	p95	1.06	ug/day	Table 4
Lead	91	p100 max	2.68	ug/day	Table 4
Cadmium	91	p50	0.00	ug/day	Table 4
Cadmium	91	p75	3.86	ug/day	Table 4
Cadmium	91	p90	6.11	ug/day	Table 4
Cadmium	91	p95	8.04	ug/day	Table 4
Cadmium	91	p100 max	23.33	ug/day	Table 4

Solid Baby-Food Exceedance Findings

The solid-food tables report exceedance counts by broad food type and intake scenario. They support category-risk context, but they do not provide category-specific concentration percentiles.

Analyte	Scenario	All solid baby foods	Category notes	Table
Lead	Exceeded FDA daily lead limit in 300 calories	15/471, 3.18%	Pouches 9/138, 6.52%; cereals 1/30, 3.33%; jars/meals 3/112, 2.68%	Table 2
Lead	Exceeded California Prop 65 lead daily limit in 300 calories	159/471, 33.76%	Cereals 13/30, 43.33%; kids’ meals 25/58, 43.10%; snacks 41/108, 37.96%	Table 2
Cadmium	Exceeded WHO cadmium daily limit for a 9 kg baby in 300 calories	10/471, 2.12%	Kids’ meals 4/58, 6.90%; jars/meals 3/112, 2.68%; pouches 3/138, 2.17%	Table 3
Cadmium	Exceeded California Prop 65 cadmium daily limit in 300 calories	38/471, 8.07%	Kids’ meals 14/58, 24.14%; pouches 11/138, 7.97%; snacks 1/108, 0.93%	Table 3

Ingredient Signals

The study reports that cadmium concentrations were higher in products containing rice, quinoa, wheat, and oats, and lower in products with apples, pears, peaches, and milk. Lead concentrations were elevated in products containing rice, quinoa, and sweet potatoes. The public wiki should treat these as ingredient-signal findings, not as finished-product row distributions unless the row mapping is explicit.

Limitations

This was a convenience sample rather than a random representative market sample. Several product-category counts differ between the purchase-frame description and later exceedance tables; the wiki preserves both instead of reconciling them silently. The study measured only lead and cadmium, and each sample was acquired and analyzed once rather than composited across multiple purchases.

Implications

Certification: Strong A-tier occurrence-context source for Pb and Cd in US infant formula and baby foods. Its full-sample source percentiles/p100 values are source-scope context, not HMTc aggregate thresholds; the main paper does not publish cereal-specific, non-rice-specific, or formula-format-specific concentration percentiles.
Courses: Useful demonstration of why product concentration, daily intake, and threshold exceedance tables must not be mixed.
App: Supports rice, quinoa, wheat/oat, sweet-potato, cereal, snack, pouch, and formula risk features after row-specific mapping.
Microbiome: No direct microbiome endpoint.

Heavy Metal Index

Index