Thats not true. I had 0% bonding and I got three babies. I had a space family and I got only one baby too, but I think the number of babies you get is random if you have a blended family.
I don't know if taking excellent care of it would help much. O.o I bought a V2 and two V3s (one a male and one a female) and they both evolved into Mametchis. I bred them and they had two babies that also evolved into Mametchis, and my V2 evolved into one, so I mated one with it and they had two...
She said "No! I will not! My momma told me not to give money to strangers!" then the littler girl who was seven threw a Tamagotchi at her, then ran away. But the tamagotchi had secret powers...