Night toilet training

My little boy has been toilet trained since December. He wears a nappy at night time as we recently had another baby in Feb and it was too much change to start training him through the night when she was born. Just wondering how you went about potty training at night time or if he’s too young? He does a wee before bed and before nappy goes on, then he takes his nappy off when he wakes up and does a wee in the toilet then. His nappy is never full, but I’d say probs 2 wees in there.