The First product we looked at was the N95 mask The masks fit very nicely. We tried them on a man, woman and children (ages 7 to 11). All had snug fits yet they were able to talk with out the mask feeling like it was going to fall off. The masks come in 5 sizes:

3000 X-Small (yellow strap) - would be good for infants
3001 Small (white strap) - Fit the children fine. even had some room for growth. The medium was a little too big for them
3002 Medium (blue strap) - Fit the woman fine
3003 Large (tan strap) - Fit the man fine.
3004 Low Profile w/ lower nose bridge (green strap)

Both a respirator and a surgical mask, the 3000 Series meets CDC guidelines for Tuberculosis exposure control, in addition to NIOSH, FDA and CDC standards for Surgical N95 protection against airborne pathogens. It also meets the highest ASTM standard for fluid resistance - 160 mm of Hg, which means that the mask will protect from most sudden liquid splashes.

The N95 mask is what the CDC uses when they go visit areas that have influenza outbreaks

You can ordere these masks here.

Next Item - Biozone Air Purifier