The body of the question has this clarification (screenshot if you can't find it for some reason http://imgur.com/b4YZ5 or if it's edited):
Does anyone have any statistics on that...
So let me try and answer that part:
Any civilian killed, especially children is tragic and it's hard to speak of it as cold statistics, but since it was requested, here is what I've gathered so far:
The statistics are debated, each side is blaming the other for bloating numbers, so it's hard to tell.
On one hand, the general evidence I've found is that the Civilian casualty ratio for the Israeli Army is not higher (and some say even lower) than other armies in recent history.
A testimony of a British Colonel to the UN (from http://www.unwatch.org/site/apps/nlnet/content2.aspx?c=bdKKISNqEmG&b=1313923&ct=7536409):
Testifying before the United Nations, Col. Richard Kemp, a British
commander, stated that: Mr. President, based on my knowledge and
experience, I can say this: During Operation Cast Lead, the Israeli
Defence Forces did more to safeguard the rights of civilians in a
combat zone than any other army in the history of warfare. Israel did
so while facing an enemy that deliberately positioned its military
capability behind the human shield of the civilian population... The
truth is that the IDF took extraordinary measures to give Gaza
civilians notice of targeted areas, dropping over 2 million leaflets,
and making over 100,000 phone calls. Many missions that could have
taken out Hamas military capability were aborted to prevent civilian
casualties. During the conflict, the IDF allowed huge amounts of
humanitarian aid into Gaza. To deliver aid virtually into your enemy's
hands** is, to the military tactician, normally quite unthinkable. **But
the IDF took on those risks.
More about this:
[Colonel Richard Kemp] spoke in 2011 about Israeli operations in the Gaza War. He said
that a study published by the United Nations showed "that the ratio of
civilian to combatant deaths in Gaza was by far the lowest in any
asymmetric conflict in the history of warfare." He stated that this
ratio was less than 1:1, and compared it favorably to the estimated
ratios in NATO operations in Afghanistan (3:1), western campaigns in
Iraq and Kosovo (believed to be 4:1), and the conflicts in Chechnya
and Serbia (much higher than 4:1, according to anecdotal evidence).
Kemp argued that the low ratio was achieved through unprecedented
measures by the IDF to minimize civilian casualties, which included
providing warnings to the population via telephone calls, radio
broadcasts and leaflets, as well as granting pilots the discretion to
abort a strike if they perceived too great a risk of civilian
casualties. He also stated that the civilian casualties that did occur
could be seen in light of Hamas' tactical use of Gazan civilians "as
human shields, to hide behind, to stand between Israeli forces and
their own fighters" and strategic use of them for exploitation of
their deaths in the media
And more from the same source:
The UN estimate that there has been an average three-to-one ratio of
civilian to combatant deaths in such conflicts worldwide. Three
civilians for every combatant killed. That is the estimated ratio in
Afghanistan: three to one. In Iraq, and in Kosovo, it was worse: the
ratio is believed to be four-to-one. Anecdotal evidence suggests the
ratios were very much higher in Chechnya and Serbia. In Gaza, it was
less than one-to-one.
Even using B'Tselem's statistics which are not the official IDF statistics, the Civilian casualty ratio for Israel is still the same or better than other armed conflicts in recent history (e.g. the Israeli army is statistically not killing more civilians than the US army, Russian army, UK army etc, and some say even less)
On the other hand there are claims that the numbers are different, such as Wikipedia.
However, the above article includes some criticism that the numbers reported by Hamas are inaccurate:
Difficulties in ascertaining an accurate Palestinian casualty count
have been attributed to a number of factors. It was reported that
Hamas fighters had been ordered not to wear military uniforms during
the fighting. Israeli-Arab journalist Khaled Abu Toameh wrote
in The Jerusalem Post that this practice led to the over-counting of
civilian casualties and under-counting Hamas military casualties, as
Palestinian casualties arrived at hospitals without weapons or any
other signs revealing they were actually fighters
And claims that even Hamas themselves have conflicting reports (from the same article)
In an interview published in the London-based Arabic newspaper Al
Hayat (November 1, 2010), Hamas interior minister Fathi Hammad stated
that around 700 of the Gaza fatalities were Hamas fighters or
militants from allied groups such as Islamic Jihad. Between 200 to 300
of these were from Hamas, and a similar number were from other
militant groups, along with about 150 security forces. These figures
differ dramatically from those given at the time of the conflict by
Hamas. As the Agence France Presse correspondent commented, "His
numbers roughly match the 709 "terror operatives" the Israeli military
said it had killed during the fighting, which included members of the
Hamas-run police force that has patrolled Gaza since the group seized
power in 2007."
Having a better Combatant to Civilian ratio than US, Russia, UK does not mean that any child being killed from either side is not a tragedy, but since the OP did request for some statistics, it seems that even with the extreme numbers, the civilian casualties ratio is not higher (or even lower) than average in conflicts of similar settings.