@morganmommy79 thank you! OK sounds great! Then by that i have plenty of the sizes till 9 mo. But need to stock up ftom there. How long do babies wear onesies? Till 9 mo. Or?

Lots. lol baby's poop on them, spit up on them, outgrow them quickly and get food on them. I like them because they're an extra layer for warmth or when it's hot baby can be stripped down to be cooler in a onesie.
Don't over buy in too many of the same size tho. Babies grow quickly. My baby had about 5-6 in each size and I kept them washed up. Seemed to work out good for me. At times I needed more but not always.
And sleepers are great for bedtime so a few each week for each size works for us