My 7 month old baby's poo is so strong i can't say he is constipated because he poos everyday but his poo comes like small hard stones maybe 5 piece?

Hard stool: Stools in infants and older children should not be hard. Sometimes a change in diet can help. Add more fluids and fruits and vegetables. However in the infants sometimes they need a stool softener because they are holding their stools because they don't like the sensation. Talk with your pediatrician as he can advise you as to what to do.

First, define: You need to explain what you mean by constipation. If baby is having hard, formed stools, that is really constipated. That will often respond to a change in formula, decreasing milk in mom's diet if breast fed. If you mean the baby grunts, pushes, cries, but passes soft or runny stools, or doesn't poop for several days, but still has soft or runny poop, that is not constipation.