My almost 6month old is breastfeeding and in between started giving him solids,and from the jar…

My almost 6month old is breastfeeding and in between started giving him solids,and from the jar puréed foods. He is gaining weight regularly and urinating regularly but pooping every 2-3 days which I'm sure is normal but he eats a lot and not to poop for couple days I know I would feel cranky. Also he spits up breast milk and other things I feed him couple times a day which sucks.** Anyone has/had the same problem as me**?!