While quite often trilogies have the second installment as the weakest, I feel like in both S2 and S3 of Sherlock the second episodes have been strong. This one was just packed full of all the things that I love.

Sherlock babysitting a mini Watson would be funny, but I feel like it would be really predictable humor. Personally, I think it's really better left to fanfic. Also, considering the canon, I feel that this is far more likely to end in tears than humor.