Heat wave

Boy was it hot out this morning, at 7:05 standing at the bus stop with the kiddos, we realized how refreshing walking by the sprinklers can be. . . and the morning gets better, took my 3 month old Alianah a bath and she was sucking on her thumb, great that's a habit hard to break. My two year old is a thumb sucker any suggestions, I've literary tried everything?