These are great tanks/undershirts, great quality, soft, thick cotton. I got the XL (9-12 month) size, fits my chubby 22 pound 11-month-old with extra room to grow into. Love how I can use them for future babies, whether boy or girl. Great for hot weather, or for layering under for colder weather. Am definitely going to order more of these, as 3 are not enough!

Update: After ordering a second set of these, they accidentally shipped me the wrong size but Amazon customer service was great, gave me a postage-paid return label to return the wrong size and I just re-ordered the the right size again.

Another Update: the chubby little guy is now a chubby 17-month-old and they still fit him as undershirts with a little room to spare. The sizing info printed on the inside has worn off on some of them but doesn't really matter much.