Height is like other traits, mostly the result of inheritance – involving multiple genes - but also the environment, particularly nutrition.
Average height for UK males is 5’9” ; females 5,4”. For the Philippines, it’s 5’4” and 5’ .
As the article in the link confirms, stunting is an indicator of malnutrition. While the prevalence of malnutrition varies, being highest in rural regions such as Autonomous Region of Muslim Mindanao, Southern Mindanao, and Eastern Visayas, it does also affect children in Metro Manila. Diet and breastfeeding are obvious factors. However, the mirror-image of malnutrition is obesity. Malnutrition may affect twice as many Filipino kids as obesity, but the first appears to be declining, the second increasing. Diet and inactivity are the main factors in obesity – not, of course, a problem unique to Filipino kids. Obesity and inactivity are serious problems, overlooked in the Philippines and nearly every other country in the world. Among the serious health effects are diabetes, cardiovascular diseases, and many cancers – which is why you don’t see many obese old people – especially males.
