It has been established that vaccination is not a risk factor for autism and is not a cause of any increase in autism prevalence rates, if any change in the rate of autism exists at all.Males have higher likelihood of being diagnosed with ASD than females. The sex ratio averages 4.3:1 and is greatly modified by cognitive impairment: it may be close to 2:1 with intellectual disability and more than 5.5:1 without. Several theories about the higher prevalence in males have been investigated, but the cause of the difference is unconfirmed; one theory is that females are underdiagnosed.The risk of developing autism is greater with older fathers than with older mothers; two potential explanations are the known increase in mutation burden in older sperm, and the hypothesis that men marry later if they carry genetic liability and show some signs of autism. Most professionals believe that race, ethnicity, and socioeconomic background do not affect the occurrence of autism. United States
In the United States it is estimated to affect more than 2% of children (about 1.5 million) as of 2016. According to the latest CDC prevalence reports, 1 in 44 children (2.3%) in the United States had a diagnosis of ASD in 2018. Prevalence is estimated at 6 per 1,000 for ASDs as a whole. History
A few examples of autistic symptoms and treatments were described long before autism was named. The Table Talk of Martin Luther, compiled by his notetaker, Mathesius, contains the story of a 12-year-old boy who may have been severely autistic.
Neonatal hypocalcemia is an abnormal clinical and laboratory hypocalcemia condition that is frequently observed in infants. It is commonly presented within the first 72 hours of a newborns life.Healthy term infants go through a physiological nadir of serum calcium levels at 7.5 - 8.5 mg/dL by day 2 of life. Hypocalcemia is a low blood calcium level. A total serum calcium of less than 8 mg/dL (2mmol/L) or ionized calcium less than 1.2 mmol/L in term neonates is defined as hypocalcemia. In preterm infants, it is defined as less than 7mg/dL (1.75 mmol/L) total serum calcium or less than 4mg/dL (1 mmol/L) ionized calcium. Both early onset hypocalcemia (presents within 72h of birth) and late onset hypocalcemia (presents in 3-7 days after birth) require calcium supplementation treatment. Infants with intrauterine growth retardation, perinatal asphyxia, preterm, and diabetic mothers are most likely to develop neonatal hypocalcemia. It is not understood why premature infants have hypocalcemia, but a proposed idea is that a large increase of calcitonin may lead to hypocalcemia. Another hypothesis includes impaired secretion of PTH or Parathyroid hormone. Cause
Risk factors of early neonatal hypocalcemia 

Prematurity
Perinatal asphyxia
Diabetes mellitus in the mother
Maternal hyperparathyroidism
Intrauterine growth retardation (IUGR)
Iatrogenic

Risk factors
Risk factors of late neonatal hypocalcemia

Exogenous phosphate load
Use of gentamicin
Gender and ethnic: late neonatal hypocalcemia occurred more often in male infants and Hispanic infants
OthersMagnesium deficiency
Transient hypoparathyroidism of newborn
Hypoparathyroidism due to other causes (DiGeorge Syndrome)

References

Jain, A., Agarwal, R., Sankar, M. J., Deorari, A., & Paul, V. K. (2010). Hypocalcemia in the newborn. Indian Journal of Pediatrics, 77, 1123-1128.