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Size 5 diapers vs early pull-ups — transition timing?

Common questionAnswered by Wermom EditorialUpdated June 11, 2026

18 month old. Still in size 4 diapers. Should I go to size 5 tape diapers or jump to pull-ups for an active toddler?

A question we hear often from parents. Here is our editorial team's evidence-based answer.

Wermom Editorial answer

Wermom Editorial TeamWermom Editorial· May 15, 2026
Pull-ups before potty training intent are usually a cost premium without benefit. Size 5 tape diapers are the right next step for an active 18-month-old who isn't ready to potty train. Move to pull-ups when potty training begins.
Related authority guidance: AAP diapering — HealthyChildren.org

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Answers marked "Verified · Wermom Editorial" are written by our editorial team. This is general information, not medical advice — always consult your pediatrician.