So my baby is 5 weeks old and we're planning on driving 4.5 hours to visit my grandfather in another state so he can meet our baby. I'm trying to pump in advance so we don't have to stop and sit at rest areas for me to BF along the way. He usually eats every 2-3 hours. But I'm unsure of how much to pump to take with us. I only pump on occasions, so dad can give a bottle while I shower or eat or rest. Here's the thing, I don't know how much he eats at once. Sometimes he can finish a 3 oz bottle and want more, sometimes he will barely finish 2 oz. What should I do??