well the who recommends until 2 years old.
(world health organisation)....

i have heard tandem feeding can reduce sibling jealousy aswell.

the more you research/read up on it - the more you might find yourself convinced
aba has alot of info...

i bf DD1 until 13 months as i thought it was a good 'goal' - had i know what i do now id have kept going...DD2 is 21months and still going!