DD is 6 weeks old and formula fed. She usually has very watery poos 3-4 times a day. However she's not pooed now for 3 days and her trumps are SO smelly (I've never noticed a smell before). HV said its normal for them to go for a few days without pooing but it doesn't feel normal to me, especially with the smell of her trumps. Could it be a sign of some intolerance or are the smelly trumps likely to be because she's not pooed?