A.K.
recently my best friend took her son in who is... three months shy of his 2nd b'day. now she is giving him soy formula due to a milk allergy. breastfeeding was out when they though it was a million diff things. however, her do said that in his opinion, he thinks kids should be on formula/breastmilk longer. that the vitamins and nutrion given is way higher than cows milk.
and yes, it can mess with their appetite. if you are planning on weaning, i did just naps.... (which is what my best friend above is also doing with formula, he still can'd digets soy milk) and when you are ready and he is ready, you will know it. don't let anyone push either way