This hadith has been reported on the authority of Anas through another chain of transmitters.
Sahih Muslim Book 44, Hadith 204
← Previous Hadith Anas reported (that his mother) Umm Sulaim said (to the Holy Prophet) Allah's Messenger, here is your servant Anas. The rest of the hadith is the same.

Sahih Muslim Book 44, Hadith 203 Next Hadith → Allah's Messenger, here is a small servant of yours, invoke blessings of Allah upon him. And he invoked blessings for me (that I should be bestowed upon) every good and this was what he (said) at the end of what be supplicated for me: O Allah, make an increase in his wealth, and progeny, and cqnfer blessings (upon him) in (each one) of them.

Sahih Muslim Book 44, Hadith 205