Real English Forty-one: Stock

The other day, when I was going for a walk in the park and pushing Taiga along in his stroller. 
A lady stopped me and said...
Here is our conversation:

Lady: Wow!  A boy or a girl?
Me: Of course a boy!  You can't tell?
Lady: Well his eyes are very big so I thought maybe he was a girl.  How old is he..7 months?
Me: No! He is about 5 and a half months.
Lady: Really?! I can't believe it. He is BIG!  How much does he weigh?
Me: About 9 kg.
Lady: He is so cute and chubby!
Me: He is not chubby! He is stocky!!
Lady:  What does stocky mean?
Me: Stocky means "short, wide, and muscular!"
Lady:  That's a funny one! He doesn't have any muscle yet! He is just a baby!

The word "stock" has many meanings.
Do you understand the below?

1.  The forecast is for a snow storm this weekend so we better stock up on food and water before it comes!
2.  I tried to buy that best-seller on Amazon last night but it was out of stock. I will try again next week...I really hope it is in stock then.
3.  I check the Tokyo Stock Exchange every day because I have some stock.
4.  The scandal considerably lowered the draft prospect's stock.
5.  Be sure you take stock of the situation before you make a decision.
6. My friend is a livestock breeder.