Baby wont fall asleep with me

So

This is driving me crazy bc of the time im spending away from my other two toddlers while trying to put the baby to sleep. My older two always nursed to sleep. Baby3 doesnt. He has to be nursed then rocked. But these days when i rock him he will not sleep. Hell scream cry for at least half an hour. Then when he finally falls asleep and I put him down he wakes up in a minute or two for booby. Then after sucking 10-20 mins hell wake up.

If dad puts him to sleep hell fall asleep fast and stay asleep for an hour.

Dad and i both work so there r days when i have all three and struggle so bad with nap time.

Pleeease advise me.

Baby is 6 months