my dd is only 6 months but is the exact same way...we haven't had more than two seconds of tummy time at a time for over a month now!...and god forbid she actually roll onto her tummy anymore - she learned quickly she didn't like that! as far as crawling - she shows no interest at all and focuses all her effort on trying to sit up and standing or jumping (while holding fingers or in jumperoo of course). i asked about this on the boards and was told that some lo's learn to crawl from a sitting position - maybe that's what yours will do. some babies don't crawl at all and just become early walkers..whatever happens, no need to worry your lo is just showing off his individuality!