Kittens walking staggeringly and softly may be caused by malnutrition, calcium deficiency, hypoglycemia, hypokalemia, or rickets. If the kitten has no other abnormalities, you can first feed some liquid calcium to strengthen it. Supplement nutrition, and then observe for a period of time to see if there is improvement. If there is no improvement, or the kitten is in poor spirits and has a loss of appetite, it is best to take the kitten to a pet hospital for examination and treatment.