Birth weight difference between siblings with different fathers ???

[Cougar]

first DH

DS 8lb 4o (due date)
DD 8lb 5o (2 days early)
DS 9lb ( 2.5weeks early)
DS 7lb 8o (induced 2 weeks early)
DD 7lb 11o ( induced 2 weeks early)

2nd DH

DD 8lb 5o ( induced 2 weeks early)
DS 8lb 12o (induced 2.5weeks early)