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प्रश्न
Write the different stages of foetus development.
सविस्तर उत्तर
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उत्तर
Human development during pregnancy is gradual, so the milestones below are approximate and can vary slightly from one pregnancy to another.
| Approximate time | Main developmental changes |
|---|---|
| 2nd month (about weeks 5–8) | The developing baby’s body plan becomes clearer, and the eyes, ears, arms and legs can be identified. |
| 3rd month (around week 10 onward) | The four-chambered heart is formed, and the nostrils, brain and lungs begin developing. |
| 4th month (about weeks 15–19) | Fingers and toes become visible and nails begin to form. The face takes on a more recognisable human profile, and the nervous system continues to develop. |
| 5th month (about weeks 20–24) | The baby begins to move. Hair may grow on the shoulders and back. |
| 6th month (about weeks 25–30) | The skin may appear reddish and wrinkled. Fingerprints develop, the eyelids can open and close, and the baby responds to some external stimuli. |
| 7th month (about weeks 26–29 in the supplied outline) | The organs continue to grow and mature, and hearing becomes well developed. The baby can respond to sounds, light and touch. |
| 8th month (about weeks 30–34) | The baby gains further maturity, with rapid development of the brain. |
| 9th month (about weeks 35–40) | The lungs and other organs approach maturity, and the baby is generally ready for birth. |
At the end of gestation, uterine contractions help deliver the fully developed baby through the birth canal.
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