What is the earliest age to safely introduce straw cup

[Stellamoonlight]

I need to stop breastfeeding my ds2. The only cup ds1 would ever take was the straw cup so I was wondering if there was an age considered safe to introduce one.

Why wouldn't they be safe at any age?

DD uses one. She's 9 months, if it helps.

It's this one:
www.nuby-uk.com/view-product?path=66_92&product_id=1044

The cups are safety tested based on their age range. I've seen straw cups in the US rated for as young as 4m+. In Europe, EN14350 warns against straw cups for younger than 6m+. Use a cup that has been safety tested and don't go below the age range guidance on the package.

DS first used one at 3mo when he nabbed someone elses. no problem then. if you're nervous judt stsy with them at first