DD came three weeks early. If I adjust her age, she is always ready to move up to the next size on that date. It is really weird. I put her in 6-9 mos PJs last night and realized this morning they are way too small.
My DD is pretty close to that also- I don't know about exact date though, because I never figured it out. She was 3 weeks early also, and tends to outgrow her clothes within the month after the size (ie, she stopped wearing her 6 month clothes by 7 months).
Re: DD knows how to follow clothing labels