1. When does birth weight double by?: Answer: 6 months of age 2. When does birth length increase by 50%: Answer: 1 year of age 3. When does the posterior fontanel close?: Answer: 8 months of age 4. At what age do babies start smiling as a social response (not gas, etc)?: Answer: 8 weeks of age 5. At what age will babies turn their heads in order to locate a sudden sound?-: Answer: 3 months of age 6. When does the mo

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