8 month old infant (eating prunes, taking pro-biotics and formula enriched w/DHA, eating other veggies and pears) started having dark black/green/tar-like poops. Is this normal? Also, once baby started eating solids, he will only take two bottles all day (5 oz) in a 10 hr period - we are giving him water, but he s only taking maybe total 3 oz. Is this ok, or should we reduce solids from 3 meals to 2?