universal studios in January

Hi
I was planning to visit Universal Studios Osaka in January with my 6 year old son who is quite keen to go. However I am worried about the extent of the crowds at that time of year.
The two dates I have available to go are either Tuesday 6th of Jan, or Saturday 10th Jan.
I had been told that Saturdays were terrible with crowds, so had planned to go the Tuesday 6th of January instead, however I have since heard this is school holidays. Is that correct?

Can anyone tell me from knowledge or experience just how crowded I can expect it to be on either of those dates? I cant seem to find an online crowd calendar for universal. My son is really keen, but if it is going to be full/ unbearably crowded and we have to wait for hours on end in queues, then I would rather avoid it.

Thanks in advance for your help. :)

Yes,and especially 6 more crowd maybe
bc in 10 already No "Magical Starlight Parade[マジカル・スターライト・パレード]" at night no good.
http://www.usj.co.jp/parkguide/schedule/201501.html
http://www.usj.co.jp/e/attraction/msp.html

But crowd or not depends on weather.
Osaka is no snow uaual but not always warmer temp,no wind and fine sky.
Watch weekly weather forecast.