Sleep Advice Please!

Ann

Hi Mamas! Needing some sleep advice please. Baby is 3.5 months old. I think he is going through his 4 month regression/4th leap. We usually start putting him down for the night around 8pm. He breastfeeds and starts to sleep. As soon as we put him in his crib he settles for a few minutes but wakes up and freaks out. So we feed again, crib again, freaks out. ..and so on. This goes on for about 2 hours most nights. Any ideas on what we can do to make this a smoother transition? We already have the room dark, use white noise, don't make eye contact or speak. We try to keep things pretty calm and follow a lot of what the sleep books say. He can't be swaddled anymore since he rolls now. Any help would be great!