Amatul Rahmân Omer:
The mothers shall give suck to their children for two full years, (this instruction is) for him who desires to complete the (period of) suckling. And it is incumbent on the man to whom the child is born (- the father) to provide them (- the mothers) the usual maintenance and their clothing (for this period) equitably and according to usage. No soul is charged with a duty except to its capacity. Neither shall a mother be made to suffer on account of her (love for her) child, nor shall he to whom the child is born (be made to suffer) on account of his child. The (father´s) heir has a like duty. However if (mother and father) both desire weaning, by mutual consent and consultation, then there is no blame on (either of) them. And if you desire to provide a wet-nurse for your children there is no blame on you, provided you hand over what you have agreed to pay equitably (and in accordance with popular usage). And keep your duty to Allâh and know that Allâh is Seer of what you do.