I'm noticing the same thing I did with DS1. Even if it's been a little while after eating, DS makes these noises like he's uncomfortable. He also often spits up when he's laying down. When DS1 seemed uncomfortable (I don't think he spit up as much), I put him in the removable seat from his swing, which is a bit more reclined than his car seat. I haven't used it yet because I have heard that seats like that can cause a baby to sleep too soundly and I don't want to elevate the risk of SIDS at all. I plan on calling our pediatrician tomorrow, but was wondering what others have experienced and what you were told to do.