If you meet a mother who is holding a baby, and the baby begins to squirm, squeal and cry, it is best to end the conversation and excuse the mother to comfort her child.
It is not a good idea to ignore the baby's cries and continue talking. Especially if you are talking about useless information that the baby's mother cares nothing about. And especially if you just KEEP TALKING while the baby cries louder and louder.
It is also NOT the best time to mention that you are a twin. Wait five minutes and someone may care. Maybe. If they aren't actively avoiding you for being so inconsiderate.