My son was 3 months 2 weeks when I ordered this item. He was 16 lb 8 oz and 27 inch long last week.
I was planning to let him try it on when he turn 6 months old, so I washed it.
Last 2 weeks, the weather was cooler, then I started to worry by his 6 months-old it will be too cold to have the short sleeves, so I had him try this on last week to take some pictures. It turned out it was too tight on him. It's basically a waste.