Fair play to Nike, they do know how to produce a decent viral video. And their latest Cristiano Ronaldo effort is one of the best we've seen on Instagram.

The social media site restricts clips to just 15 seconds, and this is one of the best examples of making the most of that limitation.

It's the third in a recent series promoting Ronaldo's new Mercurial Nike boots - the first involved the monkey and the second, the cats.

Here, Cristiano Ronaldo is seen scoring a very good goal for Portugal - to the obvious surprise of a very cute baby. It's short and sweet, and all the better for it.

Ronaldo will wear his new 'space-age' Mercurials for the first time against Barcelona in this weekend's El Clasico.

Check out the clip above - which is your favourite, the monkey, cat or baby?

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