16 days trip with JR Pass

Hi

We are arriving into Tokyo Haneda on 19 Oct and departing from the same airport on 3 Nov. Traveling with a 2-year-old and 5-year-old kid. As we are traveling with 2 kids snd 2 large luggages, we prefer less transfers and less walking from airport or train station to hotel.

Our plan is;

19 Oct airport limousine bus to Hotel sunroute Plaza Shinjuku in Tokyo
20 Oct day trip to Kamakura and Enoshima
21 Oct Explore Tokyo till time to leave Shinjuku for Kyoto
22 to 25 Oct Explore Kyoto including Arashiyama
25 Oct Kyoto to Takayama
26 Oct Day trip from Takayama to Shirakawago
27 Oct Leave Takayama for Hotel Red planet Asakusa
28, 29 Oct day trip to Fuji 5 lake or Hakone
30, 31 Oct Disneyland and Disneysea
1-3 Nov Explore Tokyo
3 Nov take Asakusa line to Haneda Airport

1. Based on our itinerary, should we buy the 7days or 14 days JR pass for 2 adults and 1 child?
2. Will our 2 year old need a JR pass?
3. Any other passes that we need?
4. From Kyoto to Takayama, is it faster and easier to go by Nagano or by Toyama?
5. Will we get to see the beautiful autumn foliage in any of the places that we are visiting?

Looking forward to your advice on the above questions.

Thanks.