These are the only pacifiers we have used for our child. He is 2.5 and has used them since birth. We did move up to size 2, but he prefers to stay at that size rather than move to the third size which felt too large for him. We keep them on a pacifier holder which is convenient. We wash them regularly. They have no smell at all if you are sensitive to that. There are so many design and color choices. I keep changing it up so we know which ones to toss and which are the new ones. We have used the glow in the dark ones, which are helpful at night, but since we use a pacifier holder, we don't need the light up one The recommendation is to replace them every 2 months, or possibly more often. When they start looking different (around 8-10 weeks, maybe even longer), I buy new ones.