Cosoms is 5 months old and she is wearing size INFANT (3 months - 24 months). Cosmos is 15 pounds. If your child is on the larger size of 24 months old I would consider the TODDLER size, but contact Tif if you need guidance.
Measure from top of nose where it meets brow to tip of chin: mask measures 3 inches long nose to chin
Please be aware that INFANT size should only be worn when only essential due to suffocation issues
Infants should be supervised wearing their mask at all times
For the purpose of proper fit, INFANT sizes will feature one continuous loop of adjustable elastic to fit behind the back of the head rather than the ears