it's very very normal. You can just carry on to have your 2nd child. While pregnant, explain to your firstborn that she is going to be a big sisters. Noone is able to accept it overnight that ' i have a new sibling' give them time to accept. she is just jealous as she feels that mommy is hers.
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if you and hubby are comfortable then you guys can go ahead with number 2. you can always talk and explain to number one. in time they will gradually understand and accept