Hi dear,I understand your concern
It seems he has
reactive lymphadenopathy due viral infection.You should be worried,but not too much.Observe for lymph.node, if it will decrease till 1sm,it is normal. If it will more,then 1 am,then perform blood test to exclude
mononucleosis, other viral infection as herpes, for this you can give Ig M,G to HHV 6 type,
Cytomegalovirus, EBV. It is also important to perform
throat culture and consult child at ENT doctor to exclude chronic infection:adenoids,
tonsillitis,ethmoiditis.If everything is Ok.You should wait at least 1month,it will decrease.For speedy recovery you should put on compress with Camphor every night(crash 2tablets,mix with water and apply to node,it will resolve, Camphor is strong antibiotics inflammed medicine).
Please contact me before visiting your primary doctor.
Wishing your baby good health