Hi mamsh, congrats sa baby! Honestly yan ang best tanong to ask your OB or pediatrician directly kasi it really depends on the size and location ng cyst, pero from what I know, maraming moms with cysts na successfully breastfed nang walang problema, a few of us actually discovered our cysts lang during pregnancy or after! The important thing is your doctor checks it out first para ma-clear kung safe talaga para sa baby, kaya seryoso ang check-up nyo ah, hindi lang casual consultation. Rooting for you mamsh!