How common is morning sickness? During early pregnancy, nausea, vomiting and tiredness are common symptoms. Around half of all pregnant women experience vomiting, and more than 80% of women (80 out of 100) experience nausea in the first 12 weeks.
Autumn is the season when warm summer temperatures gradually decrease to the cold of winter. Autumn, or fall, begins on the autumnal equinox, when the hours of daylight are equal to the hours of darkness. In the Northern Hemisphere this occurs on September 22 or 23.
The seasons are defined as spring (March, April, May), summer (June, July, August), autumn (September, October, November) and winter (December, January, February). The astronomical spring begins on 20 March 2017 and ends on 20 June 2017. The astronomical calendar determines the seasons due to the 23.5 degree tilt of the Earth's rotational axis in relation to its orbit around the sun. Both equinoxes and solstices are related to the Earth's orbit around the sun.