HELP. so my daughter is alittle over 2 weeks old and we feed her gerber gentle formula. she was fine…

HELP. so my daughter is alittle over 2 weeks old and we feed her gerber gentle formula. she was fine with the formula when we fed her. but now it seems like it's giving her issues. I'm not sure if it's the formula that's causing the problems but I think it is. the last 2 days she's been extra fussy when she's awake, she eats the formula but she seems gassy and uncomfortable afterwards. she developed bumps on her face yesterday and she seems to be spitting up more. she's drinking a milk based formula. she also seems congested in her throat. like there's phlegm in there. do you guys have an suggestions or opinions? do you think the formula could start effecting her after 2 weeks of drinking it? or do you think this is normal? LMK PLEASS