I wouldn't. It's not recommended for babies until the age of 2 I think it is? I remember when DD was sick at that age wanting to use it as she was so clogged up but the chemist said no. Not sure if it's because the vapours are so strong but also it could get in her eyes and would really sting!!

Have you got nasal spray like "Fess" for her? Hope she's better soon. Lots of mummy cuddles she needs. xx