Stoop to see second infant in cot (4)
I believe the answer is:
bend
'stoop' is the definition.
(I've seen this in another clue)
'second infant in cot' is the wordplay.
'second infant' becomes 'n' (2nd letter of 'ant').
'in' is an insertion indicator.
'cot' becomes 'bed' (cot is a type of bed).
'n' going within 'bed' is 'BEND'.
'to see' is the link.
(Other definitions for bend that I've seen before include "Lean forward" , "Dish of raw vegetables" , "Turn - buckle" , "Crook" , "It may be sinister" .)