I have 3 sows, a 3 year old and two 4 month olds. They were bonded successfully when the babies were 8 weeks old and have shown no aggressive behaviour up to now (the babies are sisters). One of my two babies has a growth disorder and is very small. Her sister is now chasing her away whenever she tries to go any where near her. There is no aggression other than this. Does anyone have any ideas on potential solutions. I have space to introduce a couple more rescue pigs if needs be, but don't want to upset the good relationship they both have with the older female, who adores them.