Swollen lymph nodes

Emmys • In love with my babies Celeste 👧🏻 Kyle Emmett 👶🏻 Adriel J. 👶🏽
My baby is currently 10 months. last night she wouldn't stop crying, the only way was if was rocking her in my arm... I was trying to check her in every way to see if she was in pain.
So I touch one of the little balls she have on the back near her ears, I know all baby have two 1 near each ears but I touch the 2 of them and I noticed that one of them was bigger than the other one.
Yes, I have talk to her doctor months after months during her checkups and he said that that's normal they will go away later on. But now I'm more concerned after I felt that one of them was bigger than the other part
My question its it its normal that one is more swollen than the other lymph nodes? 
Have someone been in this place before 
Or have her of this case????