7 months: Delta and alpha waves appear {brain development, 7 months}.
7 months: Babies can sit up without help {physical development, 7 months}. Babies can roll.
7 to 12 months: First tooth appears. Babies express anxiety at surprise, can sit with no support, and can sleep through night with two or three day naps {fifth stage of development}. Babies probably do not dream. Urination can cease for one to two hours.
07 to 24 months: Infants can have acquired fear of separation from mother {emotion development, 7 to 24 months}.
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Date Modified: 2022.0225