Fidyah amount?

Assalamualikum. If a person resides in USA and has to pay fidya for fasting and they plan to send that money to pakistan, how would the fidya amount be calcualted? According to meal cost in USA? Or meal cost in Pakistan. 2nd question is that i have read that Its not desirable for one to lie on his stomach face down, but if a 1 year old baby prefers to sleep on stomach some times during the night,should the baby be also changed position and made to lie on back or side? Please let me know. Thank you