I do not advise for changing to stage 4 since your kid is not 3yrs old and above. Stick to stage 3. You can try reduce the numbers of milk feeding per day. Give more food like what adult is eating. So you do not have to keep purchasing the milk powder. Giving cow milk, milo for your kid is ok...
Advisable to start drinking 1 month before your edd. 1 week drink about 2 times, then 2 weeks before edd, can increase the number of times per week. People say drink coconut is to have smooth delivery.
I think its really normal. I encountered hair loss after my 1st delivery 4 month later, and hair loss reduce at about a yr old for my kid. Now after 2nd delivery, encountered same thing again, hopefully it will goes off few months later. Cheers to all mummies.