Tummy time birth to 3 months. Tummy time is safe to begin the first couple weeks being home.
Another look at “tummy time” for primary plagiocephaly prevention and motor development - ScienceDirect
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Pathways.org - Baby's gaining some good head control
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Tummy time - Wikipedia
Tummy Time When to Start Tummy Time – Happiest Baby
✓WHY TUMMY TIME PILLOW - Paediatricians generally recommend parents to make their 2-6 months old babies spend at least 30 minutes of tummy time each
Taf Toys Baby Tummy Time Pillow | Perfect for 2-6 Months Old Babies, Enables Easier Development & Easier Parenting, Natural Developmental, Comfortable
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