Why does your mother’s feel pain in her knees, teeth and joints?
Allah has placed babies in the womb of women in a very salty juice, deliberately that accrue body, to lighten the weight and at the same time, to provide food without fatigue through cord associated with mother to provide the food the child needs.
During pregnancy the baby will take what the baby needs from the mother's body. While it's easy to brush off this statement as untrue, it is actually partially true. If the mother is not getting proper nutrients during pregnancy, the baby will actually "steal" the nutrients she has stored in her glands, bones, and muscles, depleting the mother's limited supply of such nutrients.
For instance, a mother who is not getting enough calcium during pregnancy is probably not going to have a brittle-boned baby. Instead, the baby is going to leach its necessary calcium supply directly from its mother's body.
If mother does not eat food, the child will not miss anything because some glands reach to melt the teeth and bones of mother to replace the missing food. There upon with increasing age the mother's teeth & knees and joints pain. This makes many people say that why women grow old before a man.
If a man knew that he has melted his mother’s bone to live, he would not know how to reward her.
O'Allah, Reward my mother and all the mothers with Jannatul Firdaus. Ameen