The baby on the boat
Can someone explain that scene to me?
Ponyo and Sosuke approach the family on the boat, the mother claims that the baby likes Ponyo, as the baby stares stone faced and emotionless at her. Ponyo offers the baby her soup which the mother eats instead on account of the baby being too young for it. Then Ponyo gives up all their food to the family and as they start to leave, the baby begins crying hysterically and starts tearing up and getting a profusely runny nose. Ponyo, as she's reverting back to fish form, then races back to the family and smears her face all over the baby's fluids on it's face as she squeezes on the baby's face. Then she races back with Sosuke on his boat and the baby finally shows some emotion, happiness and laughter.
I'm sure there is a point and something meaningful happened, i'm just not sure what exactly. Was the baby sick or did it have downs syndrome and Ponyo used her magic on it, hence her reverting to fish form temporarily?