during pregnancies, starts accumulates milk. milk amount will be stored inside a variable. if no milk is used in 2 weeks (only checked after child spawned). lactation will stops slowly.
if breasts is emptied regularly. it will increase the lactation amount.
if breasts is not emptied. it may stops lactation. (needs 2 week of no breasts usage)
sex may spill some milk
milk may overflow:
small 3 size can store 100 milk amount
big 4 size can store 800 milk amount
if milk does overflow, some sort of texture will be applied to the breasts to indicates it.
breast will get bigger based on the lactation amount