LO napping longer than usual

i noticed today my 2 month old is suddenly super hard to wake up from his daytime nap. its almost 4 hours and ive tried waking him up to feed which he had no problem drinking but he still wont wake up. he doesnt have fever and i dont suspect any other worrying symptoms so far. should i be worried and go to the polyclinic to get my LO checked out? #firsttimemom #firstbaby