Should baby be learning to drink out of straw cup?

You can if you want to at that age some people even start as early as 8months some don’t start til after 12

What I did was just put a little water or milk in a straw cup and just kept offering offering

I started at 6 months. I would put water in a straw and hold the end with my finger before dropping the water into his mouth. When he realized that he could get water from the straw, he began to naturally start drinking from it.
This link is very helpful regarding drinking from cups and straws.

https://solidstarts.com/cup-drinking/

yes! I did the same thing with my 6 months old and she learned in a minute. I do also offer her a cup of water

My son learn like 9ish months he couldn't get it down till I orderd the bear cups it seems it help a lot with babies