I would start buying now and just buy a set amount of summer and long sleeves and different sizes. Don’t buy to much and then after baby shower go from there on what else you should buy. But you can always use sleepers I would buy all sizes Carter’s has a lot of good sales on them. One day I went in a bought 7 and they were 3.20 each

My son was born in summer and still wore long sleeves socks and pants. They can’t regulate body temp right away so they still need to be dressed warm. & I thought my son would be big too but he was in NB for like 2 months. Then 0-3 for like a hot minute. 3m & 3-6m the longest. He basically skipped 9m and went straight to 12. All babies are different so I wouldn’t get too much or too little of one thing. You can always adjust once baby is actually here

I would get a little of all sizes and both long and short sleeve. More short sleeve since he'll be born in spring. I made the mistake of getting more 3-6 m stuff myself and from baby shower and my baby ended up being small and had to go buy her premie clothes lol but wait til after your baby shower (if ur having one) to see what you need

Are you having a baby shower? I waited until after.