Baby Safety / Compounds / Urea

Is Urea safe for babies and kids?

Moderate risk for kids

Infants are more vulnerable to Urea than children or adults due to immature hepatic/renal clearance, higher intake-to-body-weight ratio, rapid organ development, and increased gastrointestinal absorption.

What is urea?

Also known as: carbamide, Carbonyldiamide, Ureophil, Carbonyldiamine.

IUPAC name
urea
CAS number
57-13-6
Molecular formula
CH4N2O
Molecular weight
60.056 g/mol
SMILES
C(=O)(N)N
PubChem CID
1176

Risk for babies

Moderate risk

Infants are more vulnerable to Urea than children or adults due to immature hepatic/renal clearance, higher intake-to-body-weight ratio, rapid organ development, and increased gastrointestinal absorption.

Neonates and infants up to 12 months have incomplete blood-brain barrier development, immature Phase I/II metabolic enzymes (particularly CYP3A4, UGT1A1), and higher gastrointestinal permeability. Equivalent doses produce higher internal concentrations and longer residence times.

What to do: Minimize infant exposure through source control. For breastfeeding mothers: reduce maternal exposure. For formula-fed infants: use certified low-migration bottles and verified water sources. Consult pediatrician regarding any concerns.

Risk for pregnant and nursing people

Context-dependent

Pregnancy alters the metabolism and distribution of Urea, potentially increasing fetal exposure. The developing embryo/fetus is vulnerable during organogenesis (weeks 3-8) and neurological development. Placental transfer should be assumed.

No specific reproductive toxicity data identified, but pregnancy-specific safety data is limited for most chemicals. Precautionary minimization of exposure is recommended.

What to do: Minimize exposure during pregnancy and lactation. Consult healthcare provider regarding specific risks. Consider alternative products with lower hazard profiles.

Regulatory consensus

3 regulatory and scientific bodies have classified Urea. The classifications differ — that's the data.

AgencyYearClassificationNotes
EPA CTX / IRIS—Inadequate information to assess carcinogenic potential
EPA CTX / Genetox—Genotoxicity: positive (Ames: negative, 4 positive / 5 negative reports)
EPA CTX / Genetox—Genotoxicity: positive (Ames: negative, 4 positive / 5 negative reports)

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where kids encounter urea

  • Industrial Facilities — Manufacturing plants, Chemical storage areas, Waste treatment sites
  • Occupational Environments — Factories, Warehouses, Transportation vehicles
  • Consumer Products — dietary supplements, fortified foods, energy drinks

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Urea:

  • Inherently flame-resistant materials (wool, modacrylic, Nomex)
    Trade-offs: Higher material cost. Limited color/texture options.
    Relative cost: 2-4×
  • Barrier fabric technology
    Trade-offs: Adds manufacturing step and cost
    Relative cost: 1.2-2×

Frequently asked questions

Is urea safe for kids?

Infants are more vulnerable to Urea than children or adults due to immature hepatic/renal clearance, higher intake-to-body-weight ratio, rapid organ development, and increased gastrointestinal absorption.

What products contain urea?

Urea appears in: Manufacturing plants (Industrial facilities); Chemical storage areas (Industrial facilities); Factories (Occupational environments); Warehouses (Occupational environments); dietary supplements (Consumer products).

What should I do if my child is exposed to urea?

Minimize infant exposure through source control. For breastfeeding mothers: reduce maternal exposure. For formula-fed infants: use certified low-migration bottles and verified water sources. Consult pediatrician regarding any concerns.

Why do regulators disagree about urea?

Urea has been classified by 3 agencies including EPA CTX / IRIS, EPA CTX / Genetox, EPA CTX / Genetox, with differing conclusions. Regulators apply different standards of evidence (animal data weighting, exposure-pattern assumptions, epidemiological power thresholds), which is why two scientific bodies can review the same data and reach different conclusions. See the regulatory consensus table on this page for the full picture.

See Urea in the baby app

Look up products containing urea, compare to alternatives, and explore the full data record.

Open in baby View raw API data

Sources (2)
  1. FDA GRAS: Urea — chewing gum humectant; OTC topical keratolytic/humectant 10–40%; oral LD50 8500 mg/kg; BUN uremia marker; urea cycle product; low acute toxicity (2021) (2021) — regulatory
  2. NIOSH: Urea — fertilizer production; agricultural handling; sweat constituent; pediatric dermatological use; UF resin workplace distinction; urea breath test; uremia pathophysiology (2019) (2019) — regulatory

Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →