My 5month old boy having regulary poop,in the morning usualy,however sometimes he doesnt,whole day almost nothing,is getting frustrated,cry a lot and wriggle a lot,kicking his legs etc,he will eventualy get rid of his poops maybe in two days and is a lot of it,he is breastfed,i havent change my diet,he hasnt been introduced to solids yet,is this normal or should i have him checked ?many thanks