Answer:
This situation can lead to increased maternal levels of stress hormones which may affect the infant's brain and development.
Step-by-step explanation:
In the case of Isabel who is 6 months pregnant, she being laid off from work would create unecessary stress in her about worrying how to take care of herself and when to secure a new job to take care of herself and the baby she is carrying.
Added to the fact that she lost her sister in automoblie accident would lead to her experiencing hormonal stress. This would affect the development of the baby's brain function (like lower IQ in the baby ) and behaviour ( like clumsiness or muscle spasms in the child).