It can be really exhausting being somebodies whole world. My DD was quite bad at various stages with only wanting me and no-one else including my DH. She is now 2.5 and still has many days when 'no mummy do it' is what she says all day.
The only thing that did help my DD bond with my DH a bit better was that we started co-sleeping after her first wake up for the night from about 10 months. She still needs me to do a lot of things but most nights she actually cuddles into DH, so he knows that she loves him, its just that I am her mum and her primary caregiver. When she is tired, hungry, sad, happy, whatever I am her first point of call. I know it will get better one day, as she develops and then i will probably miss the fact that she needed me so much :-)
if you can take some breaks away from her, try and re-charge your batteries by doing something for yourself.
She is obviously very attached to you, so you have done a great job.
Bookmarks