Alhamdulillah, congrats mama! First few weeks memang penat gila lah especially with a toddler around, a few of us January mummies pun rasa macam zombie, so you're totally normal. The fatigue and hunger is real because your body is working overtime, but honestly if you're managing work and looking after your firstborn at the same time, you're already doing amazing lah. Just make sure you rest when you can and eat proper meals (I know, easier said than done!), every pregnancy is different so don't compare too much with your first, just listen to your body and your doctor during the checkups okay!