For those that aren't familiar with tummy time, now that babies sleep on their backs, they have to have supervised time on their tummies to make sure they develop the arm, leg and neck strength they need to crawl. When babies slept on their tummies, they got plenty of practice but once the experts linked tummy sleeping to SIDS and moved them all to their backs, they noticed that babies were quite delayed in crawling because they never developed those muscles.
Eventually he tires out...
and finds his thumb...
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