Am i just paranoid?

I have a 1 yr old daughter who is on soy formula. She screamed for the 1st 4 months due to her allergy that drs didnt seem to notice. She had constipation, eczema, screaming and was really hard to settle, she constantly spit up milk even after 3hrs and it would be curdled. Soy really helped her. My hubby was on soy due to an allergy that gave him bronchitis as a baby. I too was on soy as a baby for the same reason as my daughter. So i now have a 3 week old who i immediately put on soy formula, so far she seems ok, she never crys unless hungry or has pooped, she settles pretty easy i dont really need to rock her to sleep she falls asleep on her own. She never spits up she may just dribble a lil milk if she gets the hiccups or is layed down too quick after her bottle. Although she has a lil red rash on her chest and back up the top and a lil on her face, they are just little red dots and she has alot of wind during feeding. Is it possible she could develop an allergy to soy formula?