Vitamin C is essential to our immune function and it is abundant in citric fruits, kiwi, strawberries, bell peppers, broccoli and Brussel sprouts.
Having said that, if your child has recurrent infections it will be worthwhile addressing your concerns with his physician to run the appropriate tests.
I am a believer in healthy well balanced diet, healthy sleep habits and staying active to lead healthy life style and hopefully avoid illnesses!
I hope that is helpful!
To answer your question about gas drops. They are safe and effective, but they can increase constipation. Gripe water is also good for gas. Tummy massage and warm bath is another way to relief gas and fussiness.
I would not use any medication for constipation for a two-week newborn.
If the issue continues I would consider rectal stimulation for quick relief using a Q-tip with QY or Vaseline (you can also use rectal thermometer with lubricant). We do not recommend the regular use of rectal stimulation!
We do not give water as it can overload the kidney.
If all of the above don't please contact your pediatrician to rule out other organic issues.