Wife losing weight since baby was born

My wife has been losing weight since our baby was born in January 2020. She does eat her 3 meals, but often not on time due to work commitments, house work, and constant need to attend to baby, and every mid night she has to wake up to make formula Milk for Baby twice daily etc.... Is there abt particular thing I should look out for and care for as a hubby? Should I bring my wife to visit a doctor or Visit back our Gyane whom we engaged before baby was born?