They will grow at different rates..... But a 3 - 4 month old at 70 grams seems a little small. I have a female bel and a lesser male, both from same clutch hatched june 1st '09. Both were fed every five days for first three months, and are now on 7 day feeding schedule.....Bel weighs 678 grams and the lesser weighs 422 grams.....but just a note, they weighed more than 70 grams out of the egg......