Hi ladies. I've been breastfeeding, but had to start supplementing with formula a week ago due to poor weight gain and a starving baby. I'm trying to build my supply by pumping, taking fenugreek, etc. The next step may be Reglan. However, until my supply builds we've had to supplement about half of his feedings with formula (we are using Similac Organic). Since then, my baby (who will be one month on Saturday) is not pooping. He had gone 48 hours without a bowel movement. We had a dr. appt anyway... so the doctor inserted a little tube and just played around a bit. He had a HUGE bowel movement about 2 hours later. It was yellowish and watery... didn't look hard or constipated. Now it's been nearly 48 hours again and he still hasn't pooped. Should I switch formulas? Is this from the mixture of breast and formula milk? I don't know what to do! Any remedies to help him to poo? I have been doing massage and gave him a warm bath.