No sleep!!

My baby is 4 months old.

For daytime naps, after being put down, he wakes up after 15 minutes. Once I hold him he’ll sleep, and then the cycle repeats. Put down, wake up, pick up, sleep. - then after an hour or so of this, he’ll stay up because I guess he’s had his nap.

For night time, he’ll sleep for up to two hours only. Half the time he’ll sleep for only an hour.

I make sure he’s changed, fed, and burped. He’s swaddle to sleep. Due to having 2 other kids, his sleep environment isn’t always the quietest. But usually he’ll be able to fall asleep in a noisy environment.

Maybe it’s the environment?

I’m exhausted. Please help with any advice!!