Call it what you want

fix·a·tion

n.

1. The act or process of fixing or fixating.

2. An obsessive preoccupation.

3. Psychology A strong attachment to a person or thing, especially such an attachment formed in childhood or infancy and manifested in immature or neurotic behavior that persists throughout life.

pre·oc·cu·pa·tion

n.

1. The state of being preoccupied; absorption of the attention or intellect.

2. Something that preoccupies or engrosses the mind.

3. Occupation of a place in advance; preoccupancy.

ob·ses·sion

n.

1. Compulsive preoccupation with a fixed idea or an unwanted feeling or emotion, often accompanied by symptoms of anxiety.

2. A compulsive, often unreasonable idea or emotion.

One night not long ago it was a book we didn't have but that he'd seen on the back cover of another book.

Yesterday, it was a tiger tattoo that he'd had the day before but had since washed off.

Tonight, it was tiger pajamas, which of course he doesn't own and never has.

I'm not sure if this is typical three and a half year old behaviour but it's exhausting!  I vaguely remember the girls getting fixated on some things when they were younger, just not like this.

I'm hoping it's just a result of being overtired.  I think a few late nights over this long weekend have caught up with everyone.

Source: www.thefreedictionary.com