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.
If you have a daughter, you may be wondering when to begin the potty training process with her. There is no right age in general. Children start as young as a year old and go all the way up to three years old too and sometimes even four years old, if there are other physical or mental considerations to take into account. It will really depend more on your daughter as to when to begin potty training.