I give my baby breast milk throughout the day then at night, formula

If this is what works for you and your family then yes, absolutely.

Then your kid doesn't get the sleep hormones through your milk to help baby sleep like he/she would get if you just nursed. You may also loose some supply unless you pump to replace the feed.

It's fine. Fed baby is a happy baby. Don't let anyone tell you otherwise.

It is ok, if you need it to work. Just a warning, if your baby doesn't eat from breast at night most likely your supply is going to drop.

Of course it’s okay! Anyone who says otherwise is silly.

I 💯 agree with @silje!!

I used to give my baby formula in the day and breast at night. It helped my supply go up by nursing at night. Then I eventually stopped w formula and bf only