When my DD had hand foot and mouth it was ulcers in the mouth and nowhere else. Luckily it's harmless, but it gave me the shock of my life (she had about 50 ulcers in her mouth). Lots of drinks, my DD was 3 but only drank for a week, couldnt' eat as it was quite painful as you can imagine.... So with bubs just make sure lots of milk and water. Also maybe get GP for reassurance. xo