I tentatively tried a 6 month old sweater on my LO since it's raining and I needed to take him in the car. All his sweaters and coats are 6 months or bigger, so I expected it to still be pretty big. He's 2 months and 2 weeks and he was only at the 4th weight percentile at his dr visit a month ago. Lately though he's been wearing 3 month and 3-6 month onesies and has been packing on weight good. So I was stoked to find the sweater now fits him perfectly! Hopefully he'll be way up on weight percentile at his next visit. 😃