My Baby Is Completed Her 6 Months. She Was Born

my baby is completed her 6 months. she was born on 25th november. initiaaly she was only on breast feeding but after 4.5 months she start to take lactogen 1 and denying for takeng breast milk. now can i introduce packet milk ( SUDHA DAIRY ) to her. i also start to give her khichdi, daal ka pani, pure atta biscuits. please suggest. now her weight is just double of her birth weight. she had not put on much.