We tried giving DD vitamins [Poly Vi Sol, first with and then without iron] early on, but they made her miserable and I think even a little constipated [she started pooping less and screamed like she was on fire when she did], so our pediatrician said we should just try again at a later time and see how it goes.
We tried again last week. It hasn't gone well. DD has never gone a day without pooping, but when we started the vitamins, she just stopped altogether. After 3 days of that we stopped the vitamins and about 24 hours later [last night] we did get a smallish poop. And no poop yet today, but she keeps acting like she's straining to poop and it's not happening for her.
I think vitamins are out for us until she's old enough for chewables. Anyone else's LOs have similar issues?