Bringing a new sibling into the family is cause for celebration, but some kids feel threatened by a new brother or sister. These two girls are definitely not among them. How do I know? Their reactions when they find out they’re going to be big sisters is pretty clarifying. Mom gave each one of them a personalized cookie that read ‘big sister.’ At first, the girls don’t really know what to make of it. ”What does that mean?” they ask. But they don’t take long to understand their mom is pregnant and they immediately start screaming with excitement. Best reaction ever!