Bringing babies to work in some places is allowed and some it is not permitted especially, depending on type of work you do. But in some cases infant mother are given some weeks off to go and take care of their baby.
Well, it's all about what the company allowed. There are some places where it might be possible for their employees to bring their kids to work but I believe it is not mostly acceptable in a lot of companies but if you like company allows it, then their employees are free to bring their kids to work.