Thank you for your query.
It is very evident that your son has had Hypoxic Ischaemic Encephalopathy
(HIE) at birth followed by the problem following vaccination
. HIE can be due to a number of reasons and in about 1-2% cases no cause can be found. Oxytocin (Pitocin) is given to induce labour pains and does not cause drop in the heart rate
. The heart rate drops for other reasons and the doctor tries to deliver the baby faster for which emergency caesarean section
is also done.
I hope I have answered your query to your satisfaction.
Wishing your son all the best.