congested nose on a 5 month old.

My daughter has a congested nose and it's hard for her to breathe especially when she's trying to breastfeed. I did the suction thing and it helps but a minute later she's back again to the same thing. I went out to Walmart today and bought this humidifier. The only one they had for children. I post to the consultant at the pharmacy and asked if I should buy the vapor pads as well. She suggested not to because it would be too strong for my daughter. Now my question is, without the vapor pads will it still work on my daughter to let her breathe at night. First time she gets sick, first time mom, first time everything. I need help.