'Postnatal depression' is not a great explanatory panacea for the vast variety of feelings and people it can affect. First, it's not just for mums, it's for dads too and parents adopting. What is common, ironically, is that the experience is very different for each person. What is also common, is that in some way you feel out of control. The nuts and bolts of being a parent is doable, but when this is combined with the realisation that not only are you now a new person but that there is a new person in your life - forever - well the party inside your head kicks off.

Parenting is not a skill, it's a whole new world - one you can't see. You are hurled into a parallel parent universe. For some, complete with a swirl of chaos of alternate rumblings of thunder and sunlight. It's self-doubt, love, not love, confusion, anger, insecurity, disconnection and deep lows - we're talking an internal world, like nothing else you've encountered! With little respite.

For others it's just one aspect, all else feels normal. You can't pinpoint why you don't feel like you anymore or can't shake a mood. Either way, everything is compounded, ultimately affecting the connection to your child. In turn making it all spiral the wrong way. With the birth mum - you've got an atomic bomb of hormones rocketing around your system, then, leaving your system! You are essentially being bombarded like a lonely rock in the asteroid belt. Putting the physical aside, there's the reality. A little person, no hair, doesn't even bark - but is entirely and totally dependent on you and then give it time, will devour all your money, make laundry and eat all your food! There's no going back. No laughing matter. So let's get clear on what this PND is.

Little talked about it's often not explained that it can arrive with a best friend - PNA: postnatal anxiety, as if there wasn't enough! And they swap places regularly. Postnatal anxiety, the lesser discussed aspect to this post baby blues, is a feeling "in which you feel in a constant state of high anxiety, with worries about everything from your child's health, feeding, and your ability to parent ; PN obsessive compulsive disorder can involve experiencing distressing thoughts and concerns about harm coming to your baby ; and PN health anxiety which is a preoccupation that there may be something wrong with a baby's health ".

Postnatal depression is all over Google, for good reason. People mostly pretend it's not happening. So the internet can end up being your only reassurance that you're not alone. For your ease here's a selection of things 'people' check for:

• a persistent feeling of sadness and low mood
• lack of enjoyment and loss of interest in the wider world
• lack of energy and feeling tired all the time
• trouble sleeping at night and feeling sleepy during the day
• difficulty bonding with your baby
• withdrawing from contact with other people
• low to zero sex drive
• problems concentrating and making decisions
• frightening thoughts - for example, about hurting your baby