Ear infection and sore throat

my son is 12 months old and goes to daycare. He has had constant colds since he was 9 months old, thats when he started day care.

he was born 3.3kg and until 6 months he was in 50th percentile growth curve, healthy, no complications in pregnancy.
Fully breastfed until 5.5 months and then started solidsm continued bf until 10 months, therafter switched to formula since i got pregnant with the second and milk supply reduced,

he is weighing 8.5 kilo now, and he is in the 5th percentile as per the growth charts.
He is bright and alert,playful, and funny normally when he does not have ear ache or other illness.

He got a rotavirus infection at 5 months(from vaccination!!) and since then he hasnt slept through the night, until then he was a great sleeper.

there was a few homeo medications given to him
Silicea 30c
Chamomilla 200k
CArbo vegetabilis ( potency forgot)

VAnocomplex= Rhino pulsan
vanocomplex-anginacid
vanocomplex-enteroliner for diarrohea

he was also given thymuline
for immunity

Now he has the third ear infection, ( or it is a long infection which never went away)

When the ear infection started around MAy 17 2009 after constant cold, and we were advised by paed to wait before antibiotics, and we did, he had mild feverm and stayed home for one week. and we were given by the homeopath, Viburcol suppositories and oteel for drops in ear.
After one week of this treatmentm he went back to creche, within one and half weeks he was down with a cold symptoms and high fever close to 39.5 degreesm went into ER got antibio as prescription, and gave him that for 5 days, amoxicillin, we also gave him on adn off ibuprofen for pain.

Now from last week, he has pain, he is irritable, cries often for many things that he doesnt normally cry for, and wakes up in the night cryihg, The homeopath gave us yesterday a prescription of magnesium carbonicum and labolife(microimmunotherapy medicince with interleukin nucleic acids etc).

he is on it from today.

I trust the homeopath, but i do want to get it right this time, are we medicating him too much? can homeo remedies have unwanted consequences, i am not aware of manythings about homeopathy, but my mother and brother has experienced great relief from it, so i trust this as i would trust science, but the treatment varies for indivisuals and how do we as patients know they get it right? especially for babies
thanks for responding, please mention, what else i could do to support his immunity.
thanks in advance