If you are talking about [this](Contigo Kids Water Bottle with Redesigned AUTOSPOUT Straw, 14 oz., Dinos, 2-Pack https://www.amazon.com/dp/B089KVB7PT/ref=cm_sw_r_cp_api_i_F4JVTD89297QFA1FKY9F) kind, my kid could use it under 1 but he did chew through the straw part eventually so I had to replace the cup (cannot just buy a new straw unfortunately). I really like that it is truly spill proof and my kid figured out the open/close button pretty quick too. We have the stainless steel version and it was worth it to replace it.

Contigo Kids Water Bottle with... https://www.amazon.com/dp/B089KVB7PT?ref=ppx_pop_mob_ap_share