DS is 4 months old and has been getting more and more constipated - his last liquid-y poop was over a week ago and finally today I just spent over 3 hours with a thermometer / suppositories (recommended by our ped). He finally passed 4 giant stools so I'm hoping this is the start of better days, but our dr recommended giving him 4 oz of juice a day to keep him regular now.

My older daughter didn't have juice until she was 18 months, but she was breast fed and DS is now on all formula. Is this a normal thing to give such a young baby juice? It seems weird to me but I will do it if I can avoid the awful constipation!