How do you deal with unwanted advice from strangers? I have never even had any that comes across as well-meaning!

The most recent one happened yesterday. Jeremy and I were taking Oskar for a walk in his stroller and a woman came up and said "You should cover your baby's face when he is out in the cold." I have no idea what she meant, firstly, it wasn't cold, and secondly, he had a hat on - what did she think he should be wearing - a balaclava!?!? I told her he prefers to see than have his face covered.

Then she went on and on about how he was swallowing air and would have terrible wind and gastro problems that night. Swallowing air??? I had no idea how to reply to that nonsense (and he slept seven hours so no problems there!).

How do you deal with these people? Next time I think I will either not answer or say something like "My baby is healthy and happy, so please keep your criticism to yourself."