**Acknowledgements**

The following Mexican institutions supported this paper: National Autonomous University of Mexico, the National Institute of Perinatology and the National Polytechnic Institute.

### **Conflict of interest**

The authors have declared that no competing interests exist.

### **Notes/thanks/other declarations**

FJDG. Thanks to my beloved son, Manuel, a youngster with ASD who encourages me to understand how the world is seen through their eyes.
