No, NO, and NOOOOOO!!! WHY is SHE deciding what to feed YOUR child?? MAJOR RED FLAG!!! I would never let anyone watch my little baby that would do anything other than what I instruct them to do. Not even my best friend or my own mother!
No baby should get cereal before at least SIX MONTHS!! Not six or seven WEEKS!! WHAT is she THINKING?!?!!!
YES! It could not only cause problems now (this is a major CHOKING HAZZARD!), but a whole host of other problems later, including food allergies, higher obesity rates, asthma, pulmonary difficulties (from inhaling tiny bits of cereal into their lungs), digestive problems, (can result in damage to the intestines, weight loss, blood in the stool, and malnutrition) etc.
Resources/references: http://www.askdrsears.com/faq/fit3.asp, http://ow.ly/33xII, http://ow.ly/33xVn
PLEEEEEAAAAAASE make her STOP!!
Babies need to be able to hold their head up, sit with little assistance, grasp/hold items and bring them to their mouth, AND act like they are interested in eating before starting cereal!
The American Academy of Pediatrics, World Health Organization, US Department of Health and Human Services, Health Canada, UNICEF, and many other organizations all agree - wait until baby is at least six months to introduce cereal.