This will be great for the 3 month mark (I bought 0-3.) it's wide and long enough though so Iayer it now. I like this due to my little girl being very long. I would put the sizing equivalent to Baby Boden. Carter's seems drastically smaller than this. I love the color and texture and quality which is why it gets a 5. So yes it runs big compared to the standard competition but its on par with similar companies like under the Nile, Kushies and Boden.