Another logical thought is that my wife has trained her breasts for a longer period to fill up, so it could be possible that after the last express at 14h50 at work baby will push mommies Boob away or have a slow flow rate of milk when baby suckles at lets say 16h30 to about 19h00 as Milk production is now following her expressing Schedule. (exclusivepumping.com)
This is a thin piece of plastic which cover the nipple, shaping the nipple as baby suckles. (expressing-mama.com)
When baby suckles on the breast, the hormone oxytocin is released. (cindyandjana.com)