diaper

n. American English

A folded piece of absorbent material, such as paper or cloth, that is placed between a baby's legs and fastened at the waist to contain excretions.

British English: nappy, or napkin.

pacifier

n. American English

A rubber or plastic nipple or teething ring for a baby to suck or chew on.

British English: dummy
Canadian English: soother

Synonym:

baby's dummy, teething ring, comforter