Constipation. As he is struggling a lot.

Hi Doc, My baby is 1.5 yrs old. Since a few months he has been passing hard stool on average 4 days  a week. He passes stool every day mostly. Our consulting doctor prescribed Eva Q medicine for 20 days initially around November'23. Still on and off this problem was surfacing . In mid January , he prescribed MuOut for 2 months but we continued till the end of March. On the course of his medicine problem resurfaced only 4-5 each month. Now if we stop it again his stool becomes too hard. He struggles for 4-5 hrs to pass stool and in pain too. He is on top feed along with solid food like rice , dal , roti, vegetables etc. Food intake is normal. Please suggest this for immediate relief if any baby is struggling a lot to pass stool. Last night we gave Eva Q : 5ml and today morning MuOut as he is struggling a lot. Thanks Thanks