sleep regression
(psychology) A period of days or weeks during the first two years of life characterized by a change in an infant's sleep patterns, leading to irregularities such as increased awakenings and fussiness.
plural of Orzechowski
plural of ball clay
(archaic) Third-person singular simple present indicative form of emerge
多くの親は、赤ちゃんの睡眠退行期が数週間にわたって夜中に何度も起きる原因になるとは気づいていません。
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