skip it n try other food. it might be cos he dosent like it or it might be something else eg teething. the first time i intro my girl pumpkin she only took a mouth n then reject the whole bowl of porridge mixed with pumpkin. i thought she didnt like it but then i give her anyway the next day. but she didnt take it either so i skip it. then for a few days, she didnt take other food as well..then i realise a tooth coming out. after that i gave her pumkin again she takes it well. you can try other food first n see if he really dislike the veg or teething. then try the veg again maybe few weeks later.