Baby Safety / Compounds / Diisobutyl phthalate

Is Diisobutyl phthalate safe for babies and kids?

Elevated risk for kids

Infants are highly exposed to Diisobutyl phthalate through mouthing of plastic toys, teethers, bottles, and food packaging leachates. Endocrine disruption risk is amplified during critical windows of reproductive and neurological development.

What is diisobutyl phthalate?

The IUPAC name is bis(2-methylpropyl) benzene-1,2-dicarboxylate.

Also known as: bis(2-methylpropyl) benzene-1,2-dicarboxylate, DIBP, Isobutyl phthalate, Palatinol IC.

IUPAC name
bis(2-methylpropyl) benzene-1,2-dicarboxylate
CAS number
84-69-5
Molecular formula
C16H22O4
Molecular weight
278.34 g/mol
SMILES
CC(C)COC(=O)C1=CC=CC=C1C(=O)OCC(C)C
PubChem CID
6782

Risk for babies

Elevated risk

Infants are highly exposed to Diisobutyl phthalate through mouthing of plastic toys, teethers, bottles, and food packaging leachates. Endocrine disruption risk is amplified during critical windows of reproductive and neurological development.

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

Moderate risk

DIBP is a reproductive and developmental toxicant of priority concern during pregnancy. Animal studies demonstrate that DIBP exposure during the masculinization programming window (analogous to weeks 8–14 of human gestation) produces antiandrogenic effects in male offspring — reduced anogenital distance, hypospadias, cryptorchidism, and impaired testicular development. The fetal male reproductive system is the critical target. EFSA's cumulative group TDI (50 μg/kg bw/day for DEHP + DBP + BBP + DIBP) was derived specifically to protect against reproductive developmental endpoints relevant to pregnancy. Pregnant women with high combined phthalate exposure — from processed/packaged food, personal care products, and household products containing these compounds — may have fetal exposures that approach or exceed protective thresholds. Minimizing exposure to products containing DIBP and co-occurring phthalates (DEHP, DBP, BBP) during pregnancy is recommended as a precautionary measure.

Regulatory consensus

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

AgencyYearClassificationNotes
EFSA (cumulative phthalate group TDI assessment, 2019)2019no separate carcinogenicity classification; included in EFSA 2019 cumulative phthalate group TDI of 50 μg/kg bw/day for combined DEHP, DBP, BBP, DIBP based on antiandrogenic reproductive/developmental toxicity
EPA CTX / Genetox—Genotoxicity: negative (Ames: negative, 0 positive / 4 negative reports)
EPA CTX / Genetox—Genotoxicity: negative (Ames: negative, 0 positive / 4 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 diisobutyl phthalate

  • Consumer Products — Plastic bottles and containers, Food packaging, Plastic toys and household items
  • Drinking Water — Leaching from plastic pipes, Migration from bottled water containers
  • Indoor Environments — Off-gassing from plastic furniture, Degradation of plastic products
  • Fragrance — perfume, cologne, scented personal care products, household fragrance products, candles
    Identified in Fragrance Ingredient Safety Priority Research database (2,325 ingredients)

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Diisobutyl phthalate:

  • Fragrance-free formulations
    Trade-offs: Consumer preference for scented products
    Relative cost: Lower (ingredient elimination)
  • Essential oil-based fragrances (with disclosure)
    Trade-offs: Natural does not mean safe — many essential oils are skin sensitizers
    Relative cost: 2-5× conventional
  • DINCH
    Relative cost: 1.2-2×
  • Citrate esters
    Relative cost: 1.2-2×

Frequently asked questions

Is diisobutyl phthalate safe for kids?

Infants are highly exposed to Diisobutyl phthalate through mouthing of plastic toys, teethers, bottles, and food packaging leachates. Endocrine disruption risk is amplified during critical windows of reproductive and neurological development.

What products contain diisobutyl phthalate?

Diisobutyl phthalate appears in: Plastic bottles and containers (Consumer products); Food packaging (Consumer products); Leaching from plastic pipes (Drinking water); Migration from bottled water containers (Drinking water); Off-gassing from plastic furniture (Indoor environments).

What should I do if my child is exposed to diisobutyl phthalate?

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 diisobutyl phthalate?

Diisobutyl phthalate has been classified by 3 agencies including EFSA (cumulative phthalate group TDI assessment, 2019), 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 Diisobutyl phthalate in the baby app

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

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Sources (2)
  1. EFSA 2019 Cumulative Phthalate Group TDI 50 μg/kg bw/day: DEHP + DBP + BBP + DIBP Antiandrogenic Endpoint; DIBP Relative Potency Factor 1; Reproductive Developmental Toxicity; Not Carcinogenicity Assessment (2019) — regulatory
  2. EU REACH Annex XVII Entry 51 DIBP Restriction: SVHC Reproductive Toxicant Category 1B; Toys Childcare Articles >0.1% Concentration Limit; Antiandrogenic Phthalate Syndrome (2015) — 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 →