In humans, during pregnancy, several hormones like estrogens, progestogens, thyroxine and cortisol are increased several folds in

the mother's body. These hormones play crucial roles in the development and growth of the fetus, as well as preparing the mother's body for childbirth.

1. Estrogens: These hormones are produced by the placenta and the ovaries. They stimulate the growth of the uterus and breasts, preparing them for childbirth and breastfeeding. They also regulate the production of other hormones.

2. Progestogens: These hormones, particularly progesterone, are also produced by the placenta and ovaries. They help to maintain the pregnancy by keeping the lining of the uterus thick and rich with blood. They also prevent the mother's immune system from rejecting the fetus.

3. Thyroxine: This hormone is produced by the thyroid gland. It increases the metabolic rate of the mother, providing more energy for the growing fetus. It also plays a role in the development of the fetus's nervous system.

4. Cortisol: This hormone is produced by the adrenal glands. It helps to mature the fetus's lungs and other organs. It also boosts the mother's metabolism and helps her body to cope with the stress of pregnancy and childbirth.

These hormones are all increased several folds during pregnancy to support the growth and development of the fetus and prepare the mother's body for childbirth.