Spitting up a lot

My almost one month old spits up every time ! I’m breastfeeding him , and as soon as I sit him up to burp he spits up . I burp him and he burps then when he lays down in his crib he will spit up . He is always spitting up he doesn’t seem to be in pain just constantly spitting up after feeding and sometimes awhile after . Is that normal ? Anyone else experiencing that ? Also his pediatrician said maybe he’s eating too much but I don’t think so he lets go himself and he eats every 3 hours .