Cover the calendula with olive oil in a double boiler and simmer on low heat for about an hour.
Then melt in 1 oz beeswax per cup of oil
Then add 1/2 cup of tea (or 1/4 cup of tincture i+ 1/4 cup of water) of calendula for each cup of the oil/wax mixture.
Mix immediately with a submersible blender. Voila! Lotion!
For an even better baby lotion, add some comfrey and marshmallow.
Have a look at this:

Lots of good medicine making tips in my book as well.
https://homegrownherbalist.biz/product/hgh-book/
Don't use herbs or combine herbs with medications or use them during lactation or pregnancy without talking with your healthcare provider.