As I have seen other reviews, I purchased this for my 9-year-old grandson. The tracker works fine, but the band broke only after 2-3 months. The tracker was also falling out of the bottom portion of the band. I think that Fitbit needs to redesign a band that works for children.

My son is 9 years old and is the size of an 11 year old and it fits great with loads of room. He loves it and loves the compete with us on challenges. Definitely a great buy, we got it the day it released and he's even got in the bath three times with it on and forgot and it still works great!

Great product, tough for the kids. Can keep an eye on how they are going through the app.

This FitBit is great for kids. The strap is very soft, comfortable on the wrist and easily adjustable. The daily challenges and goals are motivating and engaging. The fun clock faces are a nice feature for children.

Built with the intention of making sure your young ones are as active as possible, the Fitbit Ace 2 improves on the previous model with a more eye-catching design, better screen and improved water resistance. To top it all off, it's slightly cheaper than the original, too.

Colorful design; Changeable straps; Swim-proof

Feels a bit cheap; Still somewhat expensive for what it is; App can be fiddly to set up

Fitbit released the original Ace as a fitness tracker for kids last year in a bid to tap into the older child market, and with childhood obesity growing every year it is something that should be a growing market.