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 decide to wait until a later potty training age you can still put this time to good use the interval between 12 18 months is the perfect time to start thinking about toilet readiness a set of skills and interests that will help your child master advanced toilet skills later on see belowne recent study tracking over 265 kids of potty training age for 12 months or more found that children did not show many signs until after their second year schum et al 2002 for instance most children did not show an interest in using the potty until after 24 months