Baby occipital nodes. It has?

My one year old baby has some occipital lymph nodes at both side of the head. The right side of the head three  nodes are sitting in the same place , there,  two nodes are in the size of smaller than black pepper. and another one is in the size of a peanut . And left side of the head two nodes are there  both are smaller  than black pepper. Its  been three months the nodes are there, yet not reduced in size and not getting bigger also ... I visited nearly 5 to 6 pediatricians,they  are physically  examined the nodes and told me it's very normal and nothing to worry.., but Google tells normally lymph nodes will be resolved with in one months . Here my question is why it s not disappeared yet? When it will disappear? Why persistently it has? I feel very depressed kindly advise Note: my baby is very active eating and playing well.