<div class="row-fluid">  <div class="span6">    <h5>1. Broadening of chest and shoulders</h5>    <p>Onset of puberty brings many physical changes in boys. Their chest and shoulders broaden and their muscles start to develop.</p>  </div>  <div class="span6">    <img width="670" height="240" alt="illustration of broadening of chest, shoulders and development of muscles during puberty in boys from age 9 to age 19 - Menstrupedia" src="/assets/quickguide/puberty/puberty-chest.jpg"/>  </div></div><div class="row-fluid">  <div class="span6">    <h5>2. Deepening of voice and appearance of facial hair</h5>    <p>The voice gets deeper. Hair begins to grow on the face that later develop into moustache and beard.</p>  </div>  <div class="span6">    <img width="670" height="240" alt="illustration of appearance of facial hair during puberty in boys from age 9 to age 19 - Menstrupedia" src="/assets/quickguide/puberty/puberty-face.jpg"/>  </div></div><div class="row-fluid">  <div class="span6">    <h5>3. Appearance of body hair and pubic hair</h5>    <p>Hair begins to grow on the chest, in the armpits, hands, legs and in the groin area. Hair in the groin region is called pubic hair.</p>  </div>  <div class="span6">    <img width="380" height="317" alt="illustration of hair on the chest, hands, legs, armpits and in the genital regions of a man - Menstrupedia" src="/assets/quickguide/puberty/body-hair.jpg"/>  </div></div><div class="row-fluid">  <div class="span6">    <h5>4. Increase in size of genitals</h5>    <p>The penis and the testicles grow bigger in size.</p>  </div>  <div class="span6">    <img width="670" height="240" alt="illustration of increase in size of genitals during puberty in boys from age 9 to age 19 - Menstrupedia" src="/assets/quickguide/puberty/puberty-genitals.jpg"/>  </div></div><div class="row-fluid">  <div class="span6">    <h5>5. Growth spurt</h5>    <p>During puberty boys experience a rapid growth in height over a span of 2 to 3 years. This rapid growth in height is called growth spurt.</p>  </div>  <div class="span6">    <img width="380" height="317" alt="illustration of growth in height during puberty in boys from age 9 to age 19 - Menstrupedia" src="/assets/quickguide/puberty/boy-growth.jpg"/>  </div></div><div class="row-fluid">  <div class="span6">    <h5>6. Ability to ejaculate</h5>    <p>Boys become capable of ejaculating which is ejection of semen through the penis. The first ejaculation marks the attainment of sexual maturity in a boy's life.</p>  </div>  <div class="span6">    <img width="380" height="317" alt="illustration of ejaculation - Menstrupedia" src="/assets/quickguide/puberty/puberty-ejaculate.jpg"/>  </div></div><div class="source">  <h5>References:</h5>  <ol>    <li>Teenage growth and development: 11-14 Years, <a rel="nofollow" class="reference" href="http://www.pamf.org/teen/parents/health/growth-11-14.html" target="_blank">http://www.pamf.org</a></li>  <li>Puberty and adolescence, <a rel="nofollow" class="reference" href="http://www.nlm.nih.gov/medlineplus/ency/article/001950.htm" target="_blank">http://www.nlm.nih.gov</a></li>  <li>Reproductive anatomy and physiology, <a rel="nofollow" class="reference" href="http://www.columbia.edu/itc/hs/pubhealth/modules/reproductiveHealth/anatomy.html" target="_blank">http://www.columbia.edu</a></li>  </ol></div>

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