Answer :

Final answer:

A baby is usually ready to be born about 40 weeks after the start of the last menstrual period. However, this is an average and the actual time can vary. Babies continue to develop and grow until they are born.

Explanation:

The baby is typically ready to be born after approximately 40 weeks from the start of the last menstrual period, which aligns with option 'c' of your question. This term is based on the assumption that conception occurred about 14 days after the beginning of the menstrual cycle.

However, it's important to note that this is an average estimation. Some babies may be born a little earlier or later than this. The stages of pregnancy are divided into three trimesters, each about 13 weeks long. During these stages, the pre-pregnancy uterus grows significantly to accommodate the growing fetus, causing considerable anatomical changes in the pregnant person's body.

By about 37 weeks, all the baby's organ systems are usually developed enough for it to survive outside the uterus. The baby continues to gain weight and grow in length until around the 40-week mark, by which time the baby has very little room to move and birth becomes imminent.

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