Hello ladies, have any of you already switched your babies from bassinet to crib?

My little boy just turned 3 months and when I took him to pediatrician for his monthly visit he told me I could switch him now. I was mentioning to him that his bassinet is getting too tight and small for him and he suggested that is time to switch him to his crib. We keep him on an incline on the bassinet as he suffers from reflux, but am not only concern about the incline but isn't he too little to be switched? (Obv not according to the doc).

Anyone done the switch yet, if so any tips? Or how did you cope and stopped freaking out?