I bought this for my 4 month old baby. I bought size 6-9 months as other reviews say it runs small. My son is also small for his age, in the 30th percentile. Despite this, the swimsuit fits him well, so the 6-9 month size is probably more suitable for a 3-month-old boy. Also, there is no lightning protection. He cut my kid's neck! It took less than an hour! Finally, the beak was slightly bent and didn't really protect his face or eyes, we had to buy another hat from another seller.
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