Clingy 4mo

Hello! Just curious, can 4mo baby recognise their parent left home for few days? Because during cny period, I had to be away from my baby for few nights. His caretaker (my parents) had a hard time taking care of him; fuss often, refuse to sleep in cot (usually he’s ok w it), wants to be carried always, drinking milk is ok tho. When I’m back, he welcome me with his bright smile and keep giggling 😂 everyt back to norm LOL