It's normal for brothers and sisters to get along some of the time and to fall out the rest.
Praise them often when they're getting along. Avoid the temptation to keep out of the way while they play nicely then rush in with plenty of attention when they fall out - this accidentally rewards them for disagreeing.
Set a good example. Seeing you get on well with others gives the right messages to your children. Alternatively, they will benefit from watching you sort out disagreements with others by talking things over, keeping calm and avoiding put-downs and aggression.
Keep them occupied. Boredom boosts poor behaviour. Set up a diversion. Squabbling is often a big fuss about a little thing, so distract children with something more interesting to do.
All children are unique, but birth order may make a difference to how your child acts and reacts. Eldest children tend to have a special place in the family: they may be leaders, more confident and serious than your other children. Youngest children can be more creative, charm and rebel, and can have a very affectionate nature.
Your middle child, however, has a less clear place in the family. They may feel left out and feel that they must compete for your attention. Your middle child will often find life unfair and tell you so in no uncertain terms.
There are advantages to being the middle child, they do make a close set of friends and often rely more on their friendships in the teenage years. They put effort into getting to know others and can be sensitive and understanding.
When a new baby joins the family While you are in the first flush of love for your newborn, your other children may be a bit less certain about the recent arrival. Your children will enjoy the baby if they play an important part in preparing and caring for their new brother or sister.
Before your baby's born get them involved by helping to pick some names, taking part in redecorating the baby's bedroom or choosing gifts for the baby. Afterwards they may like to help by fetching the nappies and bringing the baby clothes as you need them.
Things will go more smoothly if you can take some time every day to have fun with your older children so they can be the centre of attention and feel you love them just as much as before.
You can expect older children to take a couple of steps back in their development when a new baby arrives. They may ask for your help to do things they can usually manage alone or become more tearful than before.
Take this in your stride, it's a normal reaction to your new baby arriving and will lessen as family life settles into routine.