My DD was born on the 75th and went down to around the 10th for weight. Her height is 50th-75th and she has a fat head (90th). Her weight is pretty stable now between the 10th and 25th percentiles. Over time, i have come to realise that the weight is right for her. I'm not going to stuff her with food if she doesn't want it. - She is a healthy, happy kid who eats well.

Are you and your partner on the light side? Maybe he has just settled into his genetic weight. Is he happy, healthy in other ways?