Nine months and birth
The child grows, then is born.
A long wait
A child grows in the mother's body for a long time before it is born.
About how long does this take?
What this lesson covers
The idea
Development inside the mother's body takes approximately nine months, and birth results from rhythmic contractions of the muscles of the uterus.
A long wait
A child grows in the mother's body for a long time before it is born.
About how long does this take?
- Approximately nine months
- About nine days
- About ninety months
Months and birth
Press Next step.
Nine months to birth
The child develops inside the mother for approximately nine months. Birth happens because the muscles of the uterus contract again and again in a rhythm.
Development inside the mother's body takes approximately nine months, and birth results from rhythmic contractions of the muscles of the uterus.
Notes
Development in the mother's body takes approximately nine months, and birth is the result of rhythmic contractions of the uterine muscles.
Check yourself
About how many months does the development of the child inside the mother's body take?
Answer: 9 months
Birth is the result of …
Which muscles bring about the birth of the child?
- the growth of the placenta. The book says the child is born as a result of rhythmic contractions of the muscles in the uterus.
- a single contraction of the muscles of the leg. The muscles involved are those in the uterus, and the contractions are rhythmic.
- rhythmic contractions of the muscles of the uterus — correct. Yes!
- The muscles of the uterus — correct. Yes!
- The muscles of the oviduct. The book says the child is born as a result of contractions of the muscles in the uterus.
- The muscles of the arms. The contractions that bring about birth are in the muscles of the uterus.