Praise be to Allah.
If one of your neighbour’s daughters breastfeeds this child for five feedings, he will become her son through breastfeeding (radaa’ah) and your neighbour will become his grandmother through breastfeeding, and all her daughters – the neighbour’s daughters – will become his maternal aunts through breastfeeding. Thus she will become able to raise him throughout his childhood and beyond with no problems, because he will be a mahram to her.
This is not regarded as a trick, rather it is a legitimate shar’i solution which will enable this woman to raise this child and take care of him, and there is the hope that she will be rewarded for that by Allaah. The Prophet (peace and blessings of Allaah be upon him) said to the wife of Abu Hudhayfah concerning Saalim, the freed slave of Abu Hudhayfah: “Breastfeed him, then you will become his mahram.” Narrated by Muslim (1453).
And Allaah knows best.