Could this be constipation?

Tatiana🇨🇷♈️💍🇩🇴♏️ • Happily Married. 💏 👰🏽 12.19.08 💙 07.10.16 💓 02.29.20 💙 🐸 🤱🏽BreastMILK is best 🚫 formula

He drinks breast milk exclusively and We just started solids not too long ago, but it seems like he has a hard time when he’s having a bowel movement .. he screams and cries and I have to move his legs in order for him to get it out. 😔 could it be that he’s not drinking enough milk which is causing his stool to be a little harder to get out??!