My baby is 4 weeks old and has been spitting up quite frequently over the last week. We've switched to the sensitive formula, which isn't helping much. We also make sure she's burped well before laying her down, but she'll still spit up anywhere from 30 minutes to 2 hours after eating. I hate that she does this because I worry about reflux and not gaining weight, but also it's to the point now that I can't sleep. Every time the monitor shows she's moving and making noises I have to check on her to make sure she didn't spit up and isn't laying in it, getting cold. I guess I'm just ranting and looking for someone to commiserate with me.