Small child (3)
'small child' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tad that I've seen before include "little boy" , "Small amount or degree" , "A small amount (colloq.)" , "Slight amount" , "Smidgen" .)
'small child' is the definition.
(tot can mean a baby or toddler)
This is all the clue.
(Other definitions for tot that I've seen before include "Add a small drink of rum for the toddler" , "An arithmetic babe?" , "two fingers, perhaps" , "Add the little child?" , "Aggregate for infant" .)
(Another definition for little one that I've seen is " High Society song".)
(Other definitions for bambino that I've seen before include "Young child (Italian)" , "Italian child or baby" , "Baby with an Italian mother?" , "Babe'" , "youngster" .)