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This timeline provides a general outline of expected developments from birth to age one. Babbling usually lasts 6–9 months in total. [4] The babbling period ends at around 12 months because it is the age when first words usually occur. However, individual children can show large variability, and this timeline is only a guideline.
Gestational age: 12 weeks and 0 days until 15 weeks and 6 days old. Embryonic age: 10 weeks and 0 days until 13 weeks and 6 days old. The fetus reaches a length of about 15 cm (6 in). A fine hair called lanugo develops on the head. Fetal skin is almost transparent. More muscle tissue and bones have developed, and the bones become harder.
The first ten weeks of gestational age is the period of embryogenesis and together with the first three weeks of prenatal development make up the first trimester of pregnancy. From the 10th week of gestation (8th week of development), the developing embryo is called a fetus.
Human embryology is the study of this development during the first eight weeks after fertilization. The normal period of gestation (pregnancy) is about nine months or 36 weeks. The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus.
The first trimester is from the last menstrual period through the 13th week, the second trimester is 14th–28/29th week, and the third trimester is 29/30th–42nd week. [6] Birth normally occurs at a gestational age of about 40 weeks, though it is common for births to occur from 37 to 42 weeks. [ 6 ]
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The majority of the babies' new vocabulary consists of object words (nouns) and action words (verbs). 30–36 months The child is able to use and understand why question and basic spatial terms such as in, on or under. [citation needed] 36–42 months There is an understanding of basic color words and kinship terms. Also, the child has an ...
This task shows that children aged 15 to 20 months can assign meaning to a new word after only a single exposure. Fast mapping is a necessary ability for children to acquire the number of words they have to learn during the first few years of life: Children acquire an average of nine words per day between 18 months and 6 years of age. [27]