My littel one in seven months old and when she first went onto the nottle I searched everywhere for glass bottles which I couldn't find that wouldn't cost me an arm and a leg. Since then I have made the switch to glass. I figure better be safe than sorry. I found an nline chemist in Australia and they cost around $3.50ish from memory.

They are slightly heavier than the plastic but my little one has held her bottle from a cery young age and has no troubles holding these bottles.

I prefer to have peace of mind. Let me know if you want the name of the Chemist.