Ghost shrimp babies have a free floating stage right after they hatch which lasts 3-4 days. They are unable to swim, but need lots of food, so you must have green water with lots of floating algae for them to eat. Otherwise they starve to death because they are unable to swim after food, they just bump into it.
After that stage, they sink to the bottom and eat anything they can find.
Check the water every 2 days, make sure there is no ammonia or nitrites, and nitrates should be below 20. Baby shrimp tend to be sensitive to nitrates.
Many shrimp farms have outside pools in warm climates, so green water grows naturally there and it's easy for them to get the babies to live. Making green water inside in my tanks has always been very hard for me.
Oh yes, avoid square tanks with corners. Get a round waste basket, put in a cycled bubble sponge filter, and the bubbles should slowly circulate the water.
There are also sites on the internet for this. Search for "Breed ghost shrimp".