Pumping for one year old who wasn’t breastfed

Mumofboys🥰

I have a question..

I have a 5 month old who is ebf and a 16 month old who was formula fed and is currently on cows milk,

I have always had an excess amount of breast milk so my question is, should I pump for my 16 mo instead of giving him cows milk?

He’s had my milk before when we ran out of milk and enjoyed it!