Is it bad that I only pump once a day?

Ga

I’m currently breastfeeding my almost 1 month old. I breastfeed at every feeding every 2-4 hours except for once in the mornings when I give him expressed breast milk in a bottle so I can give him vitamin D drops because he doesn’t like them straight in his mouth. So when he uses the bottle I pump. I heard that if you don’t pump often your supply will go down. Is it bad that I’m only pumping once a day? Should I start pumping more often?