I've done a bit of research for you and on the 777LR, the aircraft they use from SYD-LAX, Delta seems to block 41 ABC, 41 GHJ, 42 DEF, and all of rows 56 and 57 from pre-assignment. That accounts for a total of 23 seats which will be available at the airport on a first-come first-served basis. Actually row 56 and 57 may be ideal for you traveling with your child since it's a 2-3-2 configuration rather than the normal 3-3-3 because of the narrowing of the aircraft towards the tail.
Something just occurred to me as well. Are you just taking the flight from Sydney to Los Angeles or are you continuing on to Atlanta? There may indeed be two seats together that can be pre-assigned just not the same seats for both legs of the flight. If this is indeed the case it can't hurt to call Delta again and ask them if they can give you separate seat assignments from SYD-LAX and then LAX-ATL. You'll have t deplane to go through customs and immigration at LAX anyway so changing seats won't be a hassle at all.
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