It is not that premature babies develop slower as such but you have to make allowances for their prematurity. So you have to correct your baby's age allowing for her 8 weeks prematurity. So in effect she is only 10 months old as regards her devlopment now. She should only start crawling now but many babies skip crawling altogether and go on to start walking without ever crawling. Your baby actually sat a bit earlier than expected after correcting her age for her prematurity.
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