Counseling The Nursing Mother: A Lactation Consultant's Guide iii. Breastfeeding And Human Lactation iv. Northwest Natural Childbirth v. Supporting Sucking Skills In Breastfeeding Infants. For suction issues or to improve the seal, apply a small amount of lubricant (e.g. KY, lip-balm, nipple cream or butter – such as USP modified lanolin) on nipple and interior of the Supple Cup.