My 3 year old daughter suffers from postnasal drip – is it safe if I use sinus rinse (squeez bottles) for her.

I do know of young children who can use the Sinus Rinse bottle, but I always recommend you check with your physician before using it on any child under 4 years old. We have a pediatric size Sinus Rinse bottle (4 ounces), which might work for your daughter if her doctor approves.