I've just started EASY on my 4 month old. We're on day 4 and each day actually seems to be a little worse, rather then getting better like I expected. It's been really warm lately and I'm worried 4 hours between feedings might be too long, and he needs to eat more often to avoid dehydration. Would a 3 or 3.5 hour EASY be ok for a 4 month old, just in hot weather?