A "thank you" not only makes others smile, but also increases your happiness and helps to create a positive attitude.
A "thank you" is the universal currency with invaluable value for every individual. Gratitude doesn't show in the form of salary in the account, month after month, year after year. It is certainly a form of saying "thank you" for the work, but an honest, said thank you is sometimes worth more - at least for the good feeling of the other person. Just say "Thank you!" once.
So just tell your mother, "Thank you for giving birth to me"