Aw mama, yan talaga common during breastfeeding, yung hormones at pressure from latching can make your gums super sensitive and prone to bleeding, lalo na if you weren't taking care of your teeth much before pregnancy. A few of us sa barkada namin experienced din yan, especially kapag ang baby's latch ay slightly off or agresibo talaga pagkuha, so I'd definitely suggest checking with your dentist or OB para ma-assess kung normal lang siya or may infection na, and para rin ma-correct ang latch ng baby if kailangan.