Our smallest size, size one, can fit some babies starting at 6 months. We recommend this size for children ages 6mos - 18mos, but all babies are so different, so definitely take a peek at the sizing chart on each product page to be sure. 

We provide sizing info based on measurements in inches, as we feel it's a bit more accurate than by pounds. Please refer to the sizing charts on each product page for our suit measurements. 

We are true to size. Although, as you know all bodies are so unique. A general guidelines we suggest below:

- Size 1: 6mo - 18mo

- Size 2T: 18mo - 2.5years

- Size 3/4T: 2.5years - 4.5years

- Size 5/6T: 4.5years - 6.5years

- Size 7/8: 6.5years - 8.5years

- Size 9/10: 8.5years - 10years

Yes, they do! If you're on the fence about sizing, we suggest going up a size so the suit can last a little longer.