So I was reading we should be weaning baby off of the bottle around 9 months with getting rid of the bottle completely by 12 months.

I'm a FTM and have no clue how to go about this.

We have switched to formula 100%. All the sippy cups I see don't have oz markings. So how do I know how much water/formula to put in?

She uses a starter (soft tip) sippy cup with water and juice/water fine. She has not figured out the 360° spill proof cups. We have not tried straws. Should she use the soft tip sippy cups until 1 yo? Then try new sippy cups?

We use Dr. Browns bottles and I have found sippy cup nipples for them. Should we try those?

Please help! I don't know what I'm doing and don't want baby to be behind becuase of me.