Bigkid

3 clues
Baby no longer
What a toddler aspires to be
Loveably immature teenager, say
Similar answers:
Abckids
Abig
Abigail
Abigailadams
Abigaildeanwill
Abigails
Abigailvanburen
Abigailwilliams
Abigbangmay
Abigdealoutofit
Abigswarmofmorays
Abigturnoff
Actbig
Actedbig
Actedthebigcheese
Aikido
Akid
Akidateeighttoy
Allkiddingaside
Allthecoolkids