Is one nap okay for my 4 month old?

my son is 4 1/2 months old and in the last week he's stopped wanting to take his normal 2-3 naps a day. He also has been waking up persistently at night instead of getting up once or not at all at night. His entire 3rd month he would take 3 naps, about an hour each or more every day, go to bed at 8 and wake up for comforting like clockwork at 4 a.m. for some comforting and then go back to sleep until 8. now he screams his head off every time I put him in his crib or give him his pacifier (sleep-time cue). Today I gave in and threw the sleep schedule out the window and just let him stay awake until he started falling asleep without being in his crib, which he slept for about 10 minutes in the morning and then from 3-6pm. I'm wondering if anyone has had similar issues with a baby this small? i think he might be teething or going through a growth spurt because he"s eating more lately, but i just can't be sure. i'm worried about overstimulating him if he's tired, but also understimulating him if he's not. help?