Poor darling, nothing worse than little ones being in pain. As Taurean mentioned, exclusively breastfed babies rarely get constipated. I remember with DS he went 14 days once without a poo and then did a normal poo, followed by another 10 day stint! Amazing how breast milk is used so efficiently by their bodies - but there was a difference because he was never in pain and it sounds like your little one is in quite a bit. I would be calling your MCHN or GP and having a chat about it, as the pain he is having combined with him not pooing frequently could be something else and it might be best to get him checked out xoxoxo