My sons are 9 and are now on .1 florinef. When they were babies, One of them was having a problem hold onto salt, and for awhile he was on .2 but boy did it make him cranky!!! His blood pressure went sky high, and the Endo called a bunch of experts and they said small babies sometimes do that, and to put him back to .1. Just make sure that they check his blood pressure, ope this helps. KB