Mine did this too and I was convinced I had a supply problem so started supplementing. It led to early weaning because of bottle preference. By baby #3, I learned that is normal behavior and doesn't mean supply problems. The supply is naturally slower/less ample later in the day. This is when we would do the nursing marathons or nurse every half hour from 5-6pm until 10pm. That lasted until 8-12 weeks when I didn't have to cluster feed as much. So, grab a jug of water, some books or your smart phone and camp out in your favorite nursing chair! It doesn't stop the fussing always but it helped me to know that was normal. Kellymom.com has some great info about this stage. GL!
Caroline-happily married to Keith since 4/27/02; momma to D (5/10/05), M (2/10/07) and S (3/25/11)