Pregnant women will not be "happy" to see their mothers.
People of the older generation always say that pregnant women will take away the baby's milk when they meet their mothers, and even it will be bad for the baby. In fact, these are all superstitions without scientific basis. Pregnant women will not be "happy" when they see their mothers, nor will they have any adverse effects on their babies.
Say hello in advance
Of course, if you really want to visit your friends, it's always right to say hello in advance. After all, every family has different customs. It's all about harmony, right?