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2. Timeline of human prenatal development - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_human_prenatal...

   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.

3. Bayley Scales of Infant Development - Wikipedia

   en.wikipedia.org/wiki/Bayley_Scales_of_Infant...

   The Bayley Scales of Infant and Toddler Development (version 4 was released September 2019) is a standard series of measurements originally developed by psychologist Nancy Bayley used primarily to assess the development of infants and toddlers, ages 1–42 months. [1]

4. Personal Child Health Record - Wikipedia

   en.wikipedia.org/wiki/Personal_Child_Health_Record

   Front cover of a PCHR from the late 1990s. The paper based child health record as used by the UK National Health Service [1] is popularly known as the "Red Book." It is given to the parents on or just after the birth of their child, and is used by parents to record standard health details such as height and weight as well as developmental milestones such as first words and first time walking. [2]

5. CDC updates its list of developmental milestones for kids ...

   www.aol.com/lifestyle/cdc-updates-list...

   Newmeyer suggests parents download the CDC's free milestone tracker app, which can help parents keep tabs on their child's development from ages 2 months through 5 years old.

6. Gesell Developmental Schedules - Wikipedia

   en.wikipedia.org/wiki/Gesell_Developmental_Schedules

   The Gesell Development Schedule operates off what is known as an individual's developmental quotient, or otherwise known as DQ. The DQ is determined according to the scores of the test and is evaluated by ascertaining whether or not the infant or child is displaying the appropriate behavior for the age (The individual's developmental quotient ...

7. Human embryonic development - Wikipedia

   en.wikipedia.org/wiki/Human_embryonic_development

   Human embryonic development covers the first eight weeks of development, which have 23 stages, called Carnegie stages. At the beginning of the ninth week, the embryo is termed a fetus (spelled "foetus" in British English). In comparison to the embryo, the fetus has more recognizable external features and a more complete set of developing organs.

8. Prenatal development - Wikipedia

   en.wikipedia.org/wiki/Prenatal_development

   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.

9. Early childhood development - Wikipedia

   en.wikipedia.org/wiki/Early_Childhood_Development

   Early childhood development is the period of rapid physical, psychological and social growth and change that begins before birth and extends into early childhood. [1] While early childhood is not well defined, one source asserts that the early years begin in utero and last until 3 years of age. [1]