I don't know of a cheat that will immediately give you free Lifetime Reward points but I know of a cheat that can help you get Lifetime Rewards faster.
Hold down Ctrl + Shift + C
Type in the cheat box : testingcheatsenabled true
Now shift-click on the mailbox outside of your Sims' house and click "Make All Happy" and then "Make Motives Static".
Now your Sims' needs like hunger, hygiene, social, etc. will remain high and never go down. You can now concentrate on your Sim completing goals faster and therefore earning Lifetime Rewards points faster. Also, when your Sims' mood is high, the rewards points will steadily climb whether you are completing goals or not.
To change the name of a child or baby, simple send one of it's parents to City Hall in town. Just find the City Hall on the map, and choose “Change Name”, and you get an option of which Sim you want to change the name of.