Hello everyone. At what age did your kids get chickenpox? They're sick…

Hello everyone. At what age did your kids get chickenpox? They're sick at home, I noticed some dots on my eldest, okay, she's 1.4 years old, and I'm afraid of getting it for my younger one who is only a month old. I think breast milk should have good immunity, but I'm scared. Have you ever had anyone in such a small age get sick?