What does "big baby" mean?

An adult or youth prone to immature behavior associated with babies, such as tantrums or pouting.

What is a synonym for "big baby"?

Common synonyms include: baby, chicken, coward, crybaby, doormat, fraidy cat.

/bɪɡ ˈbeɪbi/ noun

noun ·Rare ·Advanced level

Noun

1
An adult or youth prone to immature behavior associated with babies, such as tantrums or pouting. derogatory