In medicine, the BUN-to-creatinine ratio is the ratio of two serum laboratory values, the blood urea nitrogen (BUN) (mg/dL) and serum creatinine (Cr) (mg/dL). Outside the United States, particularly in Canada and Europe, the truncated term urea is used (though it is still the same blood chemical) and the units are different (mmol/L).
Your child must be both physically and emotionally ready for toilet training. Most children are ready to start when they are between 22 and 30 months of age, but every child is different. Toilet training usually becomes a long and frustrating process if you try to start it before your child is ready.
As with other major skills, it takes months of practice (see article on when to start potty training). Parents who start sometime before their baby is 5 months old should expect to finish around the age of 2 years. Many finish around 18 months, but in order to have a relaxed and patient mindset, parents should be prepared to spend the maximum number of months. If you finish earlier, it will be a bonus. It takes a dedicated and loving caregiver. This is not a potty training method(s) for parents in a hurry (to learn more about a method for busy parent(s), please see our Potty Training In One Day section). Expecting too much too soon can lead to giving up.