Hello, I am writing about a 7 week old baby whos tongue has turned green. She has been colicy as of late and has not slept as much or eaten as much as she used to prior to 6 weeks. She still eats, but less and more frequently. My wife and I had decided to switch her formula from Similac Sensitive to Gerber Good Start Protect and have been giving her gripe water made by Wellements Baby. We just started with gripe water a day ago and she has been introduced to the new formula over the last three days in a 1:3 ratio of new formula to the old formula. We used a cotton swab to swipe her tongue and the green residue came off the tongue and left a mark on the swab. The change in color is at the back of the tongue and she does not seem to show any signs difficulty in eating and swallowing or being in any sort of pain. What do you think could be causing this and is it enough to seek medical attention?