In less than a week, the premiere episode of "Call the Midwife" season 5 will be aired by BBC One. This time, more childbirths will keep the nuns and midwives of the Nonnatus House busy.

Based on the synopsis released by the network for the fifth season of BBC One's period drama, the Nonnatus House will be busy with numerous childbirths in different families all over the borough.

Patsy will help one experienced mother named Rhoda Mullocks give birth to a child with severe deformities. This case will show how the mother struggle in refusing to give up her newborn child. The father will reportedly have a hard time accepting the fact that his new child will have a lifetime abnormality. Sister Mary Cynthia (Bryony Hannah), Shelagh (Laura Main) and her husband Dr. Patrick Turner (Stephen McGann) will help the troubled couple accept their new challenge to mend their family.

The rest of the synopsis reads:

"Meanwhile, the new exercise craze has reached Poplar, led by Nonnatus' very own Trixie (Helen George). As she begins teaching a keep-fit class, she's surprised when the exercises lead to a medical emergency for one of her group. The experience leads her to realize that women sometimes lack a basic understanding of their own bodies, and she aims to rectify it, one patient at a time."

However, spoilers claimed that the exercise class could lead to an undesired result that the nuns and the midwives never thought could happen.

The fifth season of "Call the Midwife" is also expected to show several turn-of-the-century developments, including the use of lycra when the exercise class begins.

BBC One earlier released a 30-second trailer that featured that upsetting effects of using Thalidomide, the medicine that Dr. Turner prescribed at the end of season 4.

"Call The Midwife" season 5 premiere episode airs on Sunday, Jan. 17.