Love this bodysuit.  Baby stays cool and dry in it. A word on sizing, though, it's definitely a trimmer fit than others, and runs a tad small. My little one is 9 weeks, 12 pounds, 23 inches and the 3-6 fits him just fine with a little room to spare. There's probably little chance he'll be fitting into it past about 4 months. Overall, I love it and will be buying more!