What are these bumps on lo's face? Is it acne? Rashes?

It looks like heat rashes. Keep baby skin cool often Wipe baby face with lukewarm water and cotton after every milk feed as babies's skin are still sensitive. It is common for baby to also have baby acne. There is no need to see a doctor for it. All you need to do it keep the skin clean and apply a thin layer of lotion to moisturize the skin. I like the aveeno baby cream, It consists oatmeal which is good for dry skin.