infant mortality of heavy babies

[nix2101]

hi,

Recently in a biology lesson our teacher gave us a graph showing the relationship between the birth weight of babies, and what percentage of them die at these weights.
Of course the very small babies had the highest percentage of infant mortality, and as the weight increased the chance of death decresed. However, at about 3kg upwards the chance of death started increasing. And the chance of the baby dying was almost the same for a newborn weighing 5kg, and 1.5kg.

What is the explanation for this increase in chance of infant mortality when the baby is heavier?

I thought that a bigger baby would put the mother at more risk, but advantage the baby?

Can anybody help explain this? Was this data correct?

Thanx
Nix

[Poison]

I don't know if the info is correct or not but I guess this situation is related to the "optimum" of everything. I mean, both 1,5 and 5 kg are extreme.

[mith]

cervix or birth canal size, your baby might not be able to come out.

[Al-Hashmi]

I guess the more you depart from the mean, the more likely you will face problems wthether you are smaller than average or larger than average.
I undestand that some babies born to diabetic mothers are usually larger than average and they can have problems with their lungs similar to the smaller preterms one!

[beluga fiction]

A bigger baby is more fragile, his insulin level is ussualy at high level accordingly to the high blood glucose level of the mother; after his birth there is an imbalance between insulin and low glucid level of milk; the rest of hormones, to replace this deficit could damage the respiratory and cardiac function. Also, the metabolism of this mega-baby could not support the immune system.