We’ve used CaraCream for about 1.5 years now. My advice would be to let them send you some samples- Joel sent us 5 kits for free (but he was generous and now he’s gone, so I don’t know how many you’d get).
What dose is your little one on per day? Then I can give you better specifics about how long it will last, but- When Hailey was on 30mg a day, each kit lasted about 10 days. If we gave more, it only lasted a week.
It’s hard to say how much to get b/c it takes so long for you to get a shipment, but we tried it on several different occasions. The first time I couldn’t get Hailey to take it b/c she didn’t like the taste. She was very fussy and had an oral aversion, but just wanted to put that possibility out there before you order a really huge supply. Like I said, we did the samples first, and then once she was taking it consistently, we started ordering large 6 month supplies.
Good luck.