During the first month, the fertilized egg implants itself in the uterus lining, and the embryo begins to develop. At this stage, the baby is the size of a poppy seed.
By the second month, the baby has grown to the size of a kidney bean, and its organs, bones, and muscles begin to form. The mother may experience symptoms such as nausea, fatigue, and breast tenderness.
In the third month, the baby is about the size of a plum, and its facial features, limbs, and genitals become more defined. The mother's uterus expands, and she may experience more frequent urination.
By the fourth month, the baby is the size of an avocado, and its movements can be felt by the mother. The baby's organs continue to develop, and its sex can be determined through ultrasound.
In the fifth month, the baby grows to the size of a large mango, and its skin becomes covered with fine hair called lanugo. The mother may experience back pain and shortness of breath.
By the sixth month, the baby is the size of a small cantaloupe, and its eyes can open and close. The mother's belly becomes more visibly round, and she may experience Braxton Hicks contractions.
In the seventh month, the baby grows to the size of a large eggplant, and its lungs continue to develop. The mother may experience swelling in the feet and ankles and may need to start sleeping on her side.
By the eighth month, the baby is about the size of a small pumpkin, and its brain continues to develop rapidly. The mother may experience more frequent contractions and may need to start preparing for labor.
In the final month of pregnancy, the baby is fully developed and ready to be born. The mother's cervix begins to dilate, and she may experience stronger contractions and other signs of labor.