[Source:  Starfish Therapies]

When babies are first born, they are dependent on us for all movement.  They are suddenly in a world that has gravity and their muscles have to adapt.  So, any position you put them in their muscles are going to have to work.  If they are on their back, they are working their muscles on the front.  If they are on their belly (yes the dreaded Tummy Time), they are working their muscles on the back.  So how do they work the muscles on the side?  Its easy, by lying on their side.  It also serves an added benefit of getting them off of their back (decreases risk of getting a flat spot on the back of their head). These side muscles will help them with things like holding their head up, being able to sit, rolling, and many more.

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