Immediately after the delivery of baby and placenta...
Triggers milk production. Initially you will produce colostrum a clear liquid type which contains all the immunity boosting immunoglobulins.. you will produce colostrum upto 3 to 4 days later on actual milk production starts.

Hey anon💐💐
Congratulations first💐
Some time it comes 0ne or two days later but some of Case it comes after 2 3 hours !!if it not come bue to any problems continue keep on latching and try and try automatically milk production starts.👍👍👍👍

I had c section delivered in my 39th week and I got milk only on my 2nd day.