Other People Are Reading. Infants need a relatively high number of calories for their body weight compared to older children and adults. According to Merck, healthy infants under six month of age need about 50 to 55 calories per pound of body weight. From six months to one year, babies need about 45 calories per pound of body weight. Although newborns may lose weight in the first few days of life, they should regain their birth weight by the time they are two weeks old. By six months, babies should weigh roughly double their birth weight.
It takes an average of 4-5 years to gain a black belt in karate. Some times longer depending on your age, your natural abilities, body type, coordination levels, fitness levels, the type of sports you have done before, how much you train, how much you listen to your instructor and so on.
If you're willing to dedicate yourself you will learn a lot right away, but to master it would take years. Any school claiming that you can be a black belt or a master within 2 years is either lying to you or a belt factory type school that will teach you little or nothing. It takes many years to master any art. There is an martial arts tale, the setting changes depending on who tells it but it's basically this: A wealthy young man arrived at the Shaolin monastery and asked the headmaster, How long would it take until I became a master?. The headmaster replied, Oh 3 years at least.