3.5 month old eating a lot …

How can I get my 3.5 month old to go longer without eating? I give him 4oz . He wants to eat every 2 1/2hrs . I try his pacifier but he still screams for milk! he spits up alot as well! His pediatrician said I might be over feeding him and that he should be going like every 4-5 hours. His weight is normal though.