Boys will start to notice erections occurring more often when they reach puberty. And they're perfectly normal. An erection can happen at any time. You can get many in one day or none at all. It depends on your age, sexual maturity, level of activity, and even the amount of sleep you get. An erection can happen even when you're sleeping. Sometimes you might wake up and your underwear or bed is wet.
You may worry that this means you wet your bed like when you were little, but chances are you had a nocturnal emission, or "wet dream. Semen is released through the urethra — the same tube that urine pee comes out of. This is called ejaculation. Wet dreams occur when a boy's body starts making more testosterone. This change for boys is little bit like when a girl gets her period. It's a sign a boy is growing up and the body is preparing for the day in the future when a man might decide to be a father.
Semen contains sperm, which can fertilize a woman's egg and begin the process that ends with a baby being born. Although some boys might feel embarrassed or even guilty about having wet dreams, a boy can't help it. Almost all boys normally experience them at some time during puberty and even as adults.
But if you ever have pain or a problem with your penis or testicles, it is important that someone take you to the doctor. You may think "Man, I don't want to go to the doctor for that! It's a doctor's job to help you take care of your body — even that part. Reviewed by: KidsHealth Medical Experts. Larger text size Large text size Regular text size. But how do boys know they are growing into men? Let's find out. Here are some of the questions boys have.
If your doctor recommends weightlifting, here are some tips: Have a qualified coach or trainer supervise you. It's smart to have somebody show you the proper way to lift weights.
This will help you gain strength and prevent injury. Use lighter weights. Your coach or trainer can recommend the right amount. Lifting heavy weights can cause injuries and then you'll have to wait until you recover before you can work out again. Do repetitions. The age at which boys begin puberty is linked to when their mothers started having periods, a study suggests.
Their daughters, meanwhile, developed breasts six months earlier. The study, in the Human Reproduction journal, analysed data from nearly 16, Danish mothers and children.
One of the authors, Dr Nis Brix, of Aarhus University, Denmark, said: "Whenever a doctor meets a patient with delayed or early onset of puberty, the doctor obtains a family history. We speculate that this potential decline might be larger owing to the following reporting pattern.
A mother may likely report an age at menarche of, for example, 13 years because her menarche occurred during that period of life where she refers to her age as 13 years and hence somewhere in the range If mothers in fact reported after this pattern, the average maternal age at menarche might be up to 6 months older and the decline might, therefore, be up to 6 months larger.
For this reason, the estimated decline in age at menarche may be a conservative estimate. The age at Tanner B2 and PH2 were slightly higher than the age found in most recent Danish data, but our estimates may be prone to bias due to the high degree of left censoring.
A decline in pubertal age has been observed in other Danish studies: the age at breast development declined by 1. A potential decline in pubertal age may be driven by an increased prevalence of childhood obesity. A decline in timing of puberty may be of concern as early puberty may be causally related to later diseases in adulthood, such as obesity, diabetes mellitus, cardiovascular diseases, testicular cancer, and breast cancer.
This study was aimed to estimate a wide range of pubertal markers as reliable as possible from a nationwide sample. These data were intended to serve as the basis for comparison with both former and future data on timing of puberty. We only compared our data with former Danish data to increase the comparability as timing of puberty varies throughout the world. In boys, most pubertal milestones were attained at younger ages than previously reported, but this apparent decline should be evaluated with caution.
In girls, age at menarche occurred 3. Paediatr Perinat Epidemiol. National Center for Biotechnology Information , U. Paediatric and Perinatal Epidemiology. Published online Oct Author information Article notes Copyright and License information Disclaimer. Nis Brix, Email: moc. Corresponding author. Email: moc. This article has been cited by other articles in PMC.
Associated Data Supplementary Materials. Abstract Background A secular trend towards earlier puberty has been observed in girls, while a similar trend has been more uncertain in boys. Results In boys, voice break occurred at Conclusion These data indicate that age at menarche has declined and to some extent support a decline in age at attaining other markers of pubertal development among boys. Keywords: cohort studies, humans, menarche, puberty, sexual development, sexual maturation.
Timing of puberty in boys and girls We used a translated version of the growing and changing questionnaire from the British Avon Longitudinal Study of Parents and Children 14 and drawings of Tanner stages to collect information on puberty. Maternal age at menarche In the DNBC's first interview during pregnancy, the women, who were on average 30 years of age, recalled their age in whole years at their first menstrual period. Statistical analysis The following sampling strategy was employed in the Puberty Cohort.
Background characteristics Table 1 shows background characteristics for boys and girls in the Puberty Cohort. Background Characteristics Sex Missing No.
Open in a separate window. BMI, body mass index; d, day; y, years. Timing of puberty in boys and girls Figure 1 shows the cumulative incidence of the age at attaining Tanner stages, voice break and first ejaculation in boys, and Tanner stages and menarche in girls.
Figure 1. Pubertal milestones No. CI, confidence interval; PI, prediction interval. Difference in age at menarche Age at menarche occurred 3. Principal findings This longitudinal cohort study provides current estimates for age at attaining various pubertal milestones in both boys and girls. Strengths of the study The main strengths of this study include a large sample size with longitudinal data collection or short recall periods for age at menarche and first ejaculation, allowing us to estimate both age at attaining the pubertal milestones and difference in age at menarche between mothers and daughters with some precision.
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