If the mother decides to give milk to the baby give her a salary in a mutually fair manner. If you can not reach to an agreement, then hire another woman to suckle the child. Let the rich man spend according to his means and the less fortunate spend as much as he is capable. God is not asking anyone more than what He has given them. May God provide ease after hardship. Now Muslims are being warned of the consequence of their disobedience in this world and Hereafter as well as the reward of their obedience.