Laying down my 3 months old creates so much fuss and crying!

Vika
Within the past week or so my baby girl started crying when we lay down. She wets/poops and eats a lot! We took her to the doctors office thinking that she might have an ear infection, but that was ruled out. She doesn't have a acid reflux. She likes to be held or if we give her the pacifier she calms down.  Is she getting spoiled or experiencing growth or tweeting, early regression? She sleeps for 6 hrs of non-interrupted sleep. We try to distract her toys and singing....sometimes it works and sometimes it doesn't. She did have a small cold, which is going away. Please advise!