How do we get more blood as we grow from a baby to a child to a teen, etc.?

Question: How do we get more blood as we grow from a baby to a child to a teen, etc.?
- Keywords:
  blood,
  cardiovascular,
  human body
Asked by tomalie to Viv, Sean, Lena, Laura, Asif on 15 Mar 2012.
- Sean Murphy answered on 14 Mar 2012:
  
  When we are very young, blood formation occurs in the spleen, liver and lymph nodes. When we get older and bone marrow develops, it eventually assumes the task of forming most of the blood cells for the entire organism.
- Laura Waters answered on 15 Mar 2012:
  
  Blood can be made by our body and we make as much as we need so that is why when we donate blood it is soon replaced and we recover. Well, unless we lose two much and then we can’t recover!

tomalie commented on 14 Mar 2012:

What are lymph nodes and bone marrow?xx

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- Sean commented on 15 Mar 2012:
  
  Sorry, lymph nodes are a small ball or an oval-shaped organ of the immune system, and bone marrow is a spongy interior of your bones that is rich in stem cells
  
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tomalie commented on 16 Mar 2012:

Ah, thankyou!xx

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Question: How do we get more blood as we grow from a baby to a child to a teen, etc.?