Losing my mind!!

Ever since I’ve brought my baby girl home from the hospital (she’s 2 months), my 2.5 year old son refuses to nap. I put him in his crib every single day. Sometimes he quietly rolls around and other days he cries for mommy and daddy. On a very rare occasion he falls asleep. He legitimately falls apart around 5pm every single day. Cries over every little thing and I’m already sleep deprived from my infant and I’m losing my mind. He does go to sleep at night pretty easily and is sleeping 10-11 hours. Any suggestions?