I've put my 15 week old on aptamil hungry baby for her last night feed at 10pm, as she was waking up at 3am when she normally sleeps through. She would wake up and just not settle, but found she's brilliant with this formula. Through the day shes on aptamil 1, which shes had from birth. Anyway, she has been on it for about a week now but I've noticed her poo has changed. It has become a fair bit runnier, and I also noticed bubbles in it. The only way to describe it would be like a McDonalds milkshake (sorry!). Did anyone else notice this with their baby if they put them on this formula?