There is nothing to stop breastfeed, only thing you need to Wear a mask while handling the baby and during breastfeed. Reason being vaccination sometimes unmasks the covid infection which was already there due to lowering of immune levels.
Next Steps
Take all precautions of mask and social distance even though you are vaccinated as it does not prevent getting infection but decreases the severity of the disease
Health Tips
Repeated hand washing before handling the baby is to be important.