Luckily, we have plenty of jeans, leggings, sweaters, pajamas, and longsleeve bodysuits in 6-12 months since Ashlynn was pretty much in that size from October through last summer. I had only bought most of her summer rompers and dresses in 12-18 and stopped using onesies as soon as she could walk. Kenley will be set for fall, but until then, I got her a handful of cute lightweight bodysuits to get her through those hot summer days.
Actually, Ashlynn still fits in her denim 6-12m shorts, so looks like they'll be sharing those. I knew my girls would one day share clothes, just didn't realize it'd be so soon!