Kensington Palace announced on Monday, September 4 that the Duke and Duchess of Cambridge are expanding their family. That means they will be parents to three children under the age of five. Prince George is four years old and his sister, Princess Charlotte, is two years old. It is good that they have a live-in nanny to help with the three young children.

It is estimated that Kate Middleton might be between eight and 12 weeks pregnant and the baby is due sometime in the spring around April or May 2018. In the past, William and Kate, both 35, have expressed an interest in having a large family.

They are on their way to making it happen. A report earlier this week said that Pippa Middleton who got married last May said she wanted to be pregnant along with her sister. However, there is no word about Pippa being pregnant.

Prince Harry will drop down a notch to the sixth place in line to the throne. After Queen Elizabeth, there is Prince Charles, Prince William, Prince George, Princess Charlotte, the new baby whether boy or girl and then Prince Harry. Harry thinks the news is great that he will be an uncle for the third time.

The announcement

The announcement probably wasn't scheduled to be made so soon, but Duchess Kate had to cancel an engagement on Monday because of severe morning sickness.

She was scheduled to be at the Hornsey Road Children's Centre in London. During her last two pregnancies, she suffered from hyperemesis gravidarum. The third pregnancy is no different when it comes to the illness that many other women have when they are expecting.

The announcement from the palace was very brief which stated that Queen Elizabeth and members of both families are delighted with the news of the pregnancy.

It was also stated that the expecting mother is being cared for at Kensington Palace.

About hyperemesis gravidarum

Dr. Jennifer Ashton, an ABC health correspondent, appeared on "Good Morning America" and discussed what hyperemesis gravidarum is and how it can be treated. She explained that the condition could be very acute with severe bouts of nausea and vomiting that could cause weight loss and dehydration.

It can be treated with supplementary hydration, medication, and nutrients. Sometimes a feeding tube must be used to make sure the woman gets all the nutrients she needs for her and the baby.

When Kate was expecting Prince George in 2012, she had to be hospitalized with the condition. She also suffered with it when she was pregnant with Princess Charlotte; however, she was not hospitalized during that pregnancy. Both children were born in the Lindo Wing of St. Mary’s Hospital in Paddington, and the third royal baby will probably be born at the same place.