When my daughter had it, we found the spots on her bum first! Then she started to get a few up and down her legs and then suddenly all round her mouth and a couple on palms of her hands and the soles of her feet. A Dr I spoke to said it should be renamed HFM and bum! She had a couple of rough nights beforehand and then the spots came out. If your little one does have it, a side effect that I didn't know about is that in a few weeks time his finger nails and toe nails may suddenly start falling off. It sounds way more dramatic than it is and they grow back but I didn't know this could happen until it did. So just a pre-warning! X
My daughter had it last month, the spots / rashes / blisters are stage 2. Your little one will have had it for 1-3 days before. My daughter was upset a little as they were in her mouth but she was fine within herself. Not every baby gets really unwell with it