Looking for Advice: Moving baby to crib

Sydney

Hello, first time mom here and my baby is going to outgrow his bassinet soon. He is only 3.5 months but he only has about 1-2 more inches till he is too cramped. He sleeps well in his bassinet on his own but I'm worried about the transition as well as a good monitor for his crib.

I've read to start having him take naps in it but he typically only naps in a swing or bouncer. (If you have tips for that or if thats just a phase let me know too!)