I experienced hand numbness postpartum too, mummy 😭 Mine was worse at night and sometimes lasted most of the day. My doctor said it could be related to fluid retention, nerves, or all the baby carrying and feeding positions.
What helped me was stretching my wrists and hands regularly and being mindful of my posture. Since yours is affecting both hands and has lasted all day, I'd get it checked if it doesn't improve soon ❤️