Do baby care products need preservative efficacy testing (challenge test), and when?

Quick Answer (for busy buyers)

Here’s the buyer-first summary. If your brand name is on the label, you usually act as the responsible person and must ensure the listing is submitted and kept current.

• For US-market baby care, a formal PET is essential for any formula containing water to prove it can resist microbial contamination during repeated consumer use.
• This is a key part of your product’s safety dossier.
• We conduct this test in-house or via accredited labs, typically taking 21 days for results, and it must be completed successfully *before* initiating pilot or full-scale production runs.
• Timing-wise, we schedule PET after formula and primary packaging are finalized, usually post-stability testing but pre-production.
• For a standard baby lotion, the test inoculates the product with specific bacteria and fungi, then checks microbial counts at intervals over 28 days to ensure preservation.
• You must provide the final formula, packaging specs (e.g., pump or jar), and intended use (e.g., diaper cream).
• Failure means re-formulation, delaying timelines by 6-8 weeks minimum.
• For a US-bound baby wash SKU, we’d need 3-5kg of final pilot batch material to run the test.
• We can manage the entire process and provide the required Certificate of Analysis and test report for your files.
• Note that ‘preservative-free’ claims require even more rigorous testing and alternative preservation systems.