Your baby can start using the Otteroo at just 8 weeks old as long as he/she weighs 9 pounds or more. We actually recommend that they start at 8 weeks old (if they are weight-ready) because the earlier they start becoming familiar with the water, the less they resist it afterward. Babies also tend to be pretty open to trying new things and experiences until they reach the 5-6 month mark when they start to reject new objects and experiences that are not familiar to them. Getting the floatie around your baby’s neck will be more readily accepted before this cut off month!
That said, once they start and they love it, they should be able to comfortably use the Otteroo until they weigh 35 pounds. This is the average (50th percentile) weight of a 3 year old. All babies vary in their pace of growth so please use your best judgment in terms of when your baby has reached their comfort limit with their Otteroo.