Someone says that parents overprotect their children. But what is the very first duty of being parents? Parents should relive pain of newborn babies and protect from injuries them. Then children overprotecting is not a wrong thing.
If your children are sick you should stay in the home. You should not go garden or park. When they got sick you should minimize their works and let them to get bed rest. When you are in outside many bacteria can infect your children.
This incident is reported in United Kingdom. A mother called clear Henderson kissed her babies lips. After that her baby admitted hospital for 5 days. She has infected with Herpes virus on her lips. For the lucky she is recovered. But herpes is a dangerous virus for new born babies.
What should you understand from this? You never let anyone to kiss your babies lips. Child immunity is not powerful. So if you have running nose, do not touch babies on your hands. So protect your babies do not let kiss your babies lips for anyone.