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The extra red blood cells make your blood thicker than normal. As a result, blood clots can form more easily. These clots can block blood flow through your arteries and veins, which can cause a heart attack or stroke. Thicker blood also doesn't flow as quickly to your body as normal blood.
She may have: 1  too many red blood cells, which can make her blood too thick (polycythaemia). 2  inhaled some of her first poop (meconium), causing breathing problems. 3  low blood sugar (hypoglycaemia) 4  difficulty keeping warm.