Nursing
Suckling
noun, verbal noun, の adjective
ほいく
哺育 （ほいく） Nursing, Suckling
搾乳 （さくにゅう） Milking, Breast Pumping
哺育 means Nursing, i.e. breastfeeding a baby. 搾乳 is when a Breast Pump is used to collect human or cow milk.