Gypsy had 5 kittens last Wednesday they are 5 days old today they weight where 97g smallest 112g biggest there all gaining weighing but not same each day I've read they need to double weight by 1 week I can't see mine doing that .the smallest at 97g is now 168g on day 5 the biggest is 112g is now 174g on day 5 .should I be worrying ??