Thanks for the query.
Eating cerelac may not harm you but it may not fulfill your needs during pregnancy
as it is infant food.
You have to take include fruits, vegetables, meat, eggs, fish, cereals, milk etc. in you diet.
I f you are not able to eat a large meal at a time, you can go for smaller meals and more frequent intervals.
You have to gain at-least 9 to 11kgs weight during the pregnancy period.
Along with this you have to take iron and calcium supplements
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429