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Normal Development: 4 Months Old: References

Centers for Disease Control and Prevention. Important milestones: your baby at four months. https://www.cdc.gov/ncbddd/actearly/milestones/milestones-4mo.html. 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. https://brightfutures.aap.org/Bright%20Futures%20Documents/BF4_POCKETGUIDE.pdf. Accessed April 25, 2018.

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