The interval between twin births is usually around 15 minutes to an hour. But there have been cases where twins were born several days apart. The world record for the interval between the first and second birth was set in Cologne, Germany. The twins were born 97 days apart. One was born on November 17th, 2018, while the other one was born the following year.
Babies in the womb can hiccup during the third trimester of pregnancy. This is because the fetus begins to make its first breathing movements. The diaphragm is involved in this process, which may occasionally cause hiccups.
According to some reports, babies begin to learn their native language while still in the womb. After 26 weeks of pregnancy the peripheral auditory system is fully developed, so the baby can respond to sounds and recognize differences between them. Research with an electroencephalogram showed that the newborn’s brain clearly responds to the sounds of the mother’s language but remains indifferent to the sounds of other languages. This confirms the theory that language learning begins during pregnancy.
A woman’s voice may change during pregnancy. This is because hormonal changes can cause the vocal cords to swell. But the voice is likely to return to normal after giving birth or breastfeeding.

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