Both my boys have had terrible bowel problems...Chronic constipation and hard bowel movement.
Merilax has been a life saver, it is extremely safe (1st sone started at 3months) and very effective. It is now offered over the counter.
However, the dosage is for 17grams, I say go a 1/4 dose, at first to try. I just give my boys a 1/4 to 1/2 a dose and it softens it enough to not be painful.
Good Luck and Keep us posted