Stillbirth is a very sad thing that can happen when a mommy is going to have a baby. Sometimes, the baby stops growing before they are born or something goes wrong and they can't survive. This means that when the mommy goes to have the baby, the baby is not alive anymore.
The mommy and daddy may feel very sad when this happens because they were excited to meet their baby and now they can't. Everyone might be very sad and cry a lot. However, it's important to remember that sometimes these things happen, and it's not anyone's fault. The mommy and daddy can talk to people who can help them deal with their sadness, and they will always remember the baby they lost.