Is my baby ready for solid foods?

S.O.S!  20 oz gone before 3.30 pm!  I received an SMS from the babysitter last Monday, informing me that my baby had finished all her 20 oz daily supply of EBM and the time was 3.38 pm.  The 20 oz usually lasts up to 6 pm.  Red alert!!!

In desperation to look for solution, as I don't think I can pump that much to meet her new demand, I searched for information to see if my baby is ready for solid foods.  I found the following checklist.

Signs of readiness	My observations
Loss of tongue-thrust reflex [1, 2]	Well, I tried to let her 'taste' mashed potato last Sunday while I was having it for dinner.  Just three very little pinches of the mashed potato.  She could accept it very well.  She is 4 and a half month old after all.  How on earth would you know unless you try, right?  An excuse :)  So, this one is a tick.
Ability to let you know she is full from a "meal" [1]	She used to suck and swallow and suck and swallow until she was extremely full, and a few minutes later, the overloaded milk bursted out of her mouth.  That hardly happens now and sometimes I can even see her satisfied smile when she detaches her mouth from the breast.  So, this one is a tick.
Ability to sit up and hold head up unassisted [1, 2]	Unassisted?  Certainly no.  Unless when she is in her bumbo seat.  She cannot even roll from back to front yet.  So, this one is a cross.
Interest in your food [1, 2]	Certainly.  I have no doubt about this.  No need to say more.  So, this one is absolutely a tick.
Doubling of birth weight [1]	She was born with 3.75 kg birth weight :)  She was 5.8 kg during her 3-month jab.  She was following the growth chart perfectly.  According to the chart, her weight now should be around 6.5 kg.  Hmm ...  Not yet doubling her birth weight.  So, this one is a cross.
Frequently waking in the middle of the night when a solid sleeping pattern had been established [1]	She established her sleeping pattern when she was 2-month old.  She would sleep as early as 8 pm and waking up for milk at around 4 am.  But recently, she wakes up 2 to 3 times throughout the nights and early mornings for milk.  So, I think this one is a tick.
Baby is ready and willing to chew [2]	I could see her doing something to the mashed potato that I fed her that day and did not swallow it straightaway.  So, this one is a tick.  Err ...  I hope that I am not being bias here :)
Baby is developing a "pincer" grasp [2]	She has better control of the things that she grabs and holds lately.  But I need to do a few more 'tests' before I can make any conclusion about this.  So, lets put a cross first to be on the safe side.

Luckily, the situation did not prolong.  She consumed the usual amount on the next day.  So, maybe I can wait for a few more weeks until she scores all ticks ;) Then I will feel much better to begin introducing her to solid foods.  So, myself, keep on pumping (rigorously)!