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Normal Development: 4 Months Old: References

Centers for Disease Control and Prevention. Important milestones: your baby at four months. Updated October 25, 2017. Accessed April 25, 2018.

Hagan J, Shaw J, Duncan P, Eds. Bright Futures Pocket Guide, 4th ed. American Academy of Pediatrics, 2017. Accessed April 25, 2018.

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