1m Baby keep waking up during nap

My baby did the same. It was phase really. She slept much better when I slept next to her. And to think I almost wanted to do a sleep study. You also should time your baby sleep. If he sleeps a lot at night like a good 12 hours then he will may also just nap short naps since he is adequately rested. Sometimes they not stimulated enough that their not tired enough to take a full nap