This is my first post here. Hope I am posting in the correct forum. I am traveling with my 2 1/2 year old on the below trip. I wanted some advice on if/how to change my ticket. I have two short connections that I am afraid I may miss. Tried called LH but they wont change the tickets without change fee. Do I have any other options? There is a direct flight to FRA both with UA & LH 1 & 3 hrs later:

August 6
San Francisco International, CA (SFO) Lufthansa Duration: 10h 15min
LH9375 (Operated by United) so check-in with United
07:10+1 day London Heathrow (LHR) Economy (K)

Layover: 01h 20min

08:30+1 day London Heathrow (LHR) Lufthansa Duration: 01h 40min
LH925
11:10+1 day Frankfurt/Main International Airport (FRA) Economy (K)

Layover: 01h 50min

13:00+1 day Main Airport (FRA) Lufthansa Duration: 08h 40min
LH754
01:10 Bengaluru - Bangalore Int. (BLR) Economy (K)

Any advice would be very helpful. My toddler is usually very easy to take care of but I am afraid his terrible two may be just starting.