4mo resisting naps

Hi fellow parents, just wanted to ask if it's normal for my LO to be resisting naps at this age? He has always been a bad sleeper in the day (since NB!) but recently it's been terrible... We usually only get about 3 naps of 30min each daily. Is this normal?? I am worried that he is severely overtired since all the websites recommend total day naps of 3-5h. He behaves normally but recently has reduced his milk intake and is very distracted when latching. Also he keeps waking in the night when previously he was able to sleep well and only wake 1-2x. Help!! Some advice or reassurance needed :(