Page 3 â Measuring time in different cultures. Measuring time. Scientifically, the year is a complete cycle of seasons. A year is when the earth completes one full orbit of the sun. Its length is measured from one spring equinox to the next spring equinox. Measuring the time of year was important to most people. Knowing the season was vital when deciding to plant and harvest crops as well as managing livestock in colder climates.
Experts have believed for a long time that pregnancy weakens a womanâs immune system, making her more susceptible to illnesses like the flu. However, research released just before the start of this flu season indicates that, in the case of the flu, the opposite may be true during pregnancy.
This is because liver is also very rich in vitamin A, too much of which can cause birth defects in your baby. Some women have an increased risk of having a pregnancy affected by a neural tube defect and are advised to take a higher dose of 5 milligrams (5mg) of folic acid each day until they are 12 weeks pregnant. You have an increased risk if: you or your partner have a neural tube defect.